The Hobbit - Chapter 09 - Barrels Out of Bond

[Tuor of Gondolin]

Was Legolas present at this time? Wouldn't he have recognized Bilbo and Gloin at the Council of Elrond?

The short answer is, of course, that Legolas wasn't
yet invented. But one could surmise that he, being young
for an elf and son of the king, was still taking the elf
equifalent of a kind of coming of age, European Grand Tour
in the Eighteenth and Nineteenth Century upper class tradition.