I really think I should check this out. If not on Saturday, then maybe in a few years :)
What is it?
Technically, you would only need one time traveler convention. Time travelers from all eras could meet at a specific place at a specific time, and they could make as many repeat visits as they wanted. We are hosting the first and only Time Traveler Convention at MIT
Great idea, I'd love to help! What should I do?
Write the details down on a piece of acid-free paper, and slip them into obscure books in academic libraries! Carve them into a clay tablet! If you write for a newspaper, insert a few details about the convention! Tell your friends, so that word of the convention will be preserved in our oral history! A note: Time travel is a hard problem, and it may not be invented until long after MIT has faded into oblivion. Thus, we ask that you include the latitude/longitude information when you publicize the convention.
You can also make an absolute commitment to publicize the convention afterwards. In that case, bring a time capsule or whatever it may be to the party, and then bury it afterwards.