Who was seated on Frodo's left side at Elrond's table during the feast?

[Richelle Okada]

If you ever do get a chance to re-enact the seating arrangements at a moot, you will probably get an answer to this: We get lots of detail about Gloin on Frodo's right but who was on Frodo's left hand side at the feast? Doesn't it seem strange that he doesn't mention it? Or did he mention it when he spoke of Arwen in her canopy?