Didn't we cancel the HTC after two attempts? The latter of which was plagued by the problems with the e-mail and website which, had they not been problems during the lead up to the HTC, probably could have drawn even bigger crowds.
(I didn't go to either ET b/c of Baseball practices/games and other personal things although I would love to join in)
Also, what it seems like to me sometimes is that people do not join in on flying because no one else is flying. If there are 20+ people in session on a non-event night, pilots get excited and even more join the game. If we have <5 people in session and a Boston Centre online, not many people will join in to fly, even with the controller. It seems like this is a big part of the simulation experience; it's A LOT more fun to fly when Centre is talking a mile-a-minute to >10 aircraft then when it's you and one other VFR guy who is just flying around in circles. What might make sense to do is wait until this event become more established and more people join in, rather than expect everyone to jump on with the idea on the first try.