I would say that all Noldor marriages have to occur before the appearance of Glaurung. That should be the event that makes clear all is not peaceful in Beleriand.
Okay, here is a more complete spreadsheet, now with mortal Men! Who are tricksy with their short lifespans; getting them to overlap appropriately is not proving so easy....
And I still haven't figured out what to do with Círdan. Or dwarves, really. Or even Thingol, for that matter. Part of the challenge is that the main characters of the Battle of Sudden Flame are Angrod, Aegnor, and the House of Bëor. Figuring out how to build that up appropriately in light of what comes before is so tricky!
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