Pan HIstoria, of course) is hosted this year by the "Athens" novel, the guys decided they needed to dress accordingly... somewhat.
If you're not familiar with PH, now's a good time to check it out. You dont have to register; you can simply wander around the site as a guest (login details on the front page). The annual parade, which goes all weekend, is a major event for the site, a celebration of its rising from the ashes of its near demise six years ago. Everyone puts on his/her best RPG party frock and has a blast.