Technically, you need only 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. The first and only Time Traveler Convention will be hosted at MIT on May 7, 2005, starting at 8:00pm EDT (08 May 2005 00:00:00 UTC)
East Campus Courtyard, MIT
(42.360007,-071.087870 in decimal degrees)
The event will start with lectures and/or music, and at 10pm the moment of truth will arrive.
Added by drw on May 3, 2005