Edited: adjusting Amras' trajectory a little, based on an idea from Corey
Episode 4: Places Set Apart
Galadriel goes to Doriath to become Melian’s pupil. Círdan returns to the havens.
The Fëanorians move into East Beleriand, where Eöl is outraged at his new neighbors. While the Fëanorians establish and begin building their castles in the present, we get to know what Eöl has been up to through long ‘flashbacks’ (for lack of a better word) as he discusses the injustice of this situation with his servants, and with his Dwarven visitors. He and his servants came to Nan Elmoth to get away from tiresome and arrogant people, not to meet new ones! Described in as much detail as you want to include, here: https://forums.signumuniversity.org/index.php?threads/session-4-02-season-4-episode-outlines.3019/page-7#post-22670
Amras initially wants to live alone far from his brothers. Maedhros persuades him to live near him on Himring, but Amras is judgemental towards his brothers and keeps going on about their doom. He hates all his brothers except Maedhros.
(I do not want the Fëanorians wantonly murdering Dwarves, but if everyone else really wants to make up that sory, this is the only reasonable time to do it: before the Noldor meet any Dwarves at all. Which means we have to explain what Petty-Dwarves are doing at Himring, or Rerir, or Aglon.)
either Episode 4 or Episode 5:
“Of Beleriand and its Realms”. The Houses of Fingolfin and Finarfin establish towns and fortify Mithrim, Eithel Sirion, Nevrast, Vinyamar, and Dorthonion. They establish their courts and more formal long-lasting relations with the Sindar.
Finrod gets his wish to go exploring, and visits his sister in Doriath.
Many Sindar, mostly Falathrim but some from the inland peoples, move north to settle in Nevrast and Mithrim. Ecthelion and Glorfindel are instrumental in welcoming them to Nevrast? The remaining Falathrim set up a village of huts on the Isle of Balar – they aren’t sure it’s safe to return to their home shores yet.
Death of Norn?
Villain storyline: Morgoth is away from Angband for cryptic reasons, and Sauron has been left in charge. Orcs are multiplying, Gothmog and Boldog are building new armies. Skirmishes between Elves and Orcs continue to happen, but always at night. Sauron has a different job: sending doppleganger spies among the Noldor. Eavesdropping on conversations, they learn that the Noldor have done things they’re ashamed of, and that the houses have had a feud.
(Morgoth discovers Men in Hildórien, but finds that he can no longer shapeshift. Hiding his hideous, terrifying appearance from them, he considers how to enslave these insects.)
Episode 5: Mereth Aderthad
Turgon’s court hosts Fingolfin’s Feast of Reuniting in Nevrast. Attendees include: all of the houses of Fingolfin and Finarfin, Galadriel, Maedhros, Maglor, Noldorin extras from all three houses (not many Fëanorians), Beleg, Mablung, Daeron, Círdan, Celeborn, Annael, many Sindarin extras not from Doriath.
NOT attending are Thingol, Melian, Lúthien, Eöl, the other sons of Fëanor, nor any Dwarves (but maybe Amras attends, and is disappointed to find Maglor there?)
Daeron and Maglor singing contest? duet?
A ‘false peace’ exists, as the Sindar don’t know the truth about the Noldor, and the lack of significant activity from Angband makes some people consider the Sun to have conquered Morgoth’s Orcs. The Sindar are enamored of these wealthy, knowlegeable, skilled warriors who saved their civilization from immanent destruction.
Celeborn and Galadriel have a heart-to-heart while looking out over the Falathrin ships in the harbor. Galadriel reveals some of the darkness that is over the Noldor, but focuses on the personal tragedy of having lost her mother. She telepathically reveals an image of her holding her mother’s corpse, with the background blurred out. She does not reveal the Kinslaying, though she wavers. Celeborn is a good, sympathetic listener, and considerate towards her pain. Orodreth meets a lovely Sinda lady (Meril).
The Sindar inquire, again, for news from Olwë and Finwë, from the Valar. The Noldor give evasive answers or none at all. They say they don't want to talk much about the Darkening of Valinor because it was so awful (which it was).
Villain storyline: Sauron’s spies attend the Feast in disguise as ordinary Sindar – perhaps Thuringwethil, perhaps Sauron himself. From eavesdropping on side conversations they learn about the Kinslaying and rebellion.
Episode 5, 6, 7, or 8:
Amras is sick of Maglor visiting Himring all the time, and of not being listened to. He moves all the way to Amon Ereb, far away from all his brothers.
Episode 6: Questions
Morgoth returns to Angband and orders Sauron to go corrupt the Second Children.
Galadriel tells Melian the rest of the Darkening of Valinor – that Morgoth murdered Finwë and stole Fëanor’s Silmarils, the last trace of the light of the Trees. Out of pride, or shame, or to protect Fingolfin and Fingon, she does not say a word about the Kinslaying, even when pressed by Melian. But she hints obliquely at the rebellion (of which she isn’t ashamed!)
Melian shares the pertinent parts of this with Thingol, who is bothered, but does not think it too serious to continue on in friendship with the Noldor (who after all have a common enemy).
Orodreth marries Meril in Dorthonion. Attending are all of Meril’s family, and all of the House of Finarfin (and Eldalotë’s parents, if they’re alive and in Middle-earth. (Galadriel and Celeborn declare their love?)
Some Sindar are questioning the gaps in the official Noldorin story, and realize they’re behaving like people who have something to hide. Speculation, and rumors of crimes committed in Valinor, begin.
either Episode 6 or Episode 7:
Rumors about the arrival of the Noldor spread through the Sindar. The rumors are even worse than the truth: all the Noldor are guilty of Kinslaying the Teleri and each other, they hate the Valar, they burned the stolen Telerin ships out of spite, etc... (We show somehow that demon dopplegangers are starting the rumors.)
Not yet knowing these rumors, Celeborn tells Thingol about his niece Eärwen’s death. For now Thingol thinks Eärwen died in the Darkening... but later this bit of news will feed the rumors and his rage at the Noldor.
Celeborn and Galadriel plight their troth (or declare their love to each other). Galadriel wants to meet Celeborn’s parents and family.
Finrod and brothers visit Galadriel. She asks him why he won’t marry. Finrod flashes back to a memory of Amárië. He makes his statement about never marrying, and an oath he will one day swear, and foretells his own death. (Either during a separate visit after Orodreth’s marriage, or during the visit in Episode 7. Or even wait until Episode 10.)
Episode 7: The Truth Will Out
Sauron returns from Hildórien and debriefs?
The rumors reach an explosive head. Círdan, believing the Noldorin houses are spreading rumors about each other out of jealousy, brings them to Thingol’s attention. Thingol believes the tales that the Noldor murdered Olwë and all his family, and plan to steal the Sindar’s homes. It just so happens that Finarfin’s sons are in Doriath. When Thingol confronts Angrod about his less-than-full tale of the flight of the Noldor, Angrod angrily accuses the Fëanorians of Kinslaying and burning the ships, and speaks of the rebellion and Helkaraxë. He feels no more obligation to protect the Fëanoreans from the truth of their own misdeeds. Thingol angrily and shrewdly asks Angrod whether the houses of Fingolfin and Finarfin are truly innocent of this bloodshed – can Angrod swear to it? Angrod can’t bring himself to make a bold-faced lie, even to defend Fingolfin and Fingon, perhaps realizing that Thingol and Melian will catch his lie. (He looks in Melian’s stern face and knows he can’t fool her?)
Thingol bans the speaking of Quenya and wearing any jewels except pearls, saying that those who do so are betrayers of kin and Kinslayers unrepentant. He sends the sons of Finarfin away, but not forever. Círdan and Thingol mourn the death of Olwë.
The sons of Finarfin discuss what happened. Angrod is sorry for the trouble his outburst will cause, but not sorry for the Fëanorians. Finrod still believes that reconciliation and unity are too important to squander.
Fingolfin as High King accepts the terms of the ban. He finds it more important to keep peace with their new neighbors than to protect their own culture. He’s fine with speaking Sindarin and who needs to wear jewels, anyway? The Noldor continue to speak Quenya only in private, amongst themselves.
The Fëanorians are furious. Somebody ratted them out, and Caranthir correctly guesses Angrod is to blame. The Fëanorians (except Maedhros) become increasingly sour about cooperating with the other two houses.
In Angband, Morgoth laughs.
Episode 8: Dagor Aglareb
Finrod begins establishing Minas Tirith on Tol Sirion.
Earthquakes. Thangorodrim and the Iron Mountains spew clouds of ash that ominously spread out over the northlands. Ashfall on Ard-galen, Hithlum, and the Marches of Maedhros.
Morgoth and Gothmog unleash a large army of Orcs on the north. All the good guys must put aside their differences to unite against the assault. Forgiveness so they can work together to protect their lands is wise.
Fingolfin, Fingon, Finrod, and Maedhros set up the Siege of Angband. Council of the Noldor at Eithel Sirion (or Minas Tirith?) to discuss strategy, at which Fingolfin proudly boasts that Morgoth will never
break their siege. (Maedhros is the only Fëanorian attending the council.)
Morgoth is dismayed... but doesn’t react like somebody who has lost a war. (Sauron works on developing better armor and weapons?)
Episode 9: Portents
Minas Tirith is complete. Finrod and Turgon travel down the Sirion to the Meres of Twilight. They receive dream messages from Ulmo warning that the peace will not last.
Sauron returns from Hildórien and debriefs?
Finrod visits Galadriel in Menegroth and seeks Thingol’s help, telling him of his dreams. Thingol tells him about the caves of Narog, saying the Dwarves have spoken of that place. Thingol sets up a meeting with the Dwarves to aid Finrod.
Ulmo shows Turgon the vale of Tumladen.
Episode 10: Accord and Separation
The Petty-dwarves are driven out of Nulukkizdin by Dwarves of Eryd Luin, who lie to Finrod. They represent Nulukkizdin as a place that they themselves have abandoned and freely give away. Finrod does not know about the Petty-Dwarves, and trusts his new friends to be honest. (he doesn’t mind-read them, or if he does they block him)
Turgon’s people begin building Gondolin in secret. (Aredhel stays behind with Idril in Nevrast?) Turgon insists on absolute secrecy. He wants to be away from the other Noldor, partly to avoid having to even interact with Fëanorians.
Caranthir meets the Dwarves of the Blue Mountains. He initially insults them over their “unloveliness”, and they decide to trade with Celegorm and Curufin instead. Curufin and takes an interest in trying to learn Khuzdul, although the Dwarves are reluctant to teach their language to outsiders. Celebrimbor befriends several Dwarves, exchanges various crafting techniques, and is happy. (Fëanorians learn to make mail?)
Amras is anti-social on Amon Ereb.
A company of Orcs sneak the long way around Hithlum, come up the Firth of Drengist, and ambush the Noldor in Mithrim. Their assault fails, but the Noldor misinterpret their victory as a sign of Morgoth’s weakness. In reality, he’s merely testing them. Boldog is disgraced. Morgoth gives Sauron a new, mysterious job (cryptic references to creating Dragons, but nothing that could spoil the surprise).
Episode 11: Hewer of Caves
Finrod, Noldor, and [handsomely paid] Dwarves work on building Nargothrond. Finrod personally carves many of the stone pillars and walls with scenes of Valinor. Dwarves name him ‘Felagund’. Finrod’s people purchase mail armor as well. Young Zirak has heard the Noldor love jewelry and offers to craft some of Felagund’s unworked treasure into something beautiful, but Finrod respects Thingol’s ban on wearing jewels and has no desire to alienate the Sindar.
Turgon’s people continue building Gondolin in secret.
Círdan rebuilds the Havens with the help of the Noldor from the House of Finarfin, who fortify them. Finrod builds Barad Nimras to guard the sea. Círdan expresses his desire to continue to work with them and help them in their times of need despite the Kinslaying. He does not want to do Morgoth’s work for him.
Amras tries to sabotage Curufin and Celegorm’s trade with the Dwarves by forbidding them from travelling through the lands he has claimed.
Episode 12: The Hidden City
50 years later:
Turgon secretly moves all of his people, and all the Sindar in Nevrast, to Tumladen. He completes Gondolin with images of the Two Trees which he has made himself. Turgon establishes from the start the absolute secrecy rules, that nobody can leave, etc. Aredhel already disagrees with this.
Galadriel marries Celeborn. The ceremony is attended by her brothers and Fingolfin; and by Celeborn’s father Galadhon, mother, and brother Galathil (and a sister?). (and Orodreth?)
Nargothrond is complete. Young Zirak presents Finrod Felagund with beautiful lamps designed to light his new home, of the same kind that light Menegroth. Finrod moves in, leaving Orodreth in charge of Minas Tirith.
The Dwarves have moved their trade-road further north and established trade with Caranthir. Celegorm, Curufin, and Amras are disgruntled, while Caranthir has become very, very rich.
Villains make a cryptic reference to Men.
Episode 13: The Golden One
Young Glaurung escapes Angband and devastates the north (particularly Ard-galen). The Elves are shocked. Angrod and Aegnor fall back to Dorthonion. Fingon fights Glaurung back to Angband with horsed archers, winning great praise. Few Elves realize what a bad sign this is.
Turgon stays safely in Gondolin and does not fight.
Thingol stays safely in Doriath and does not fight.
Telchar makes her last work – the Dragon-Helm – and gifts it to Azaghâl.