If on the off-chance we actually do some kind of event for Halloween, we should probably sort out who's available when in advance so that timezone differences are as small a problem as possible. Post when you're free on Monday the 31st as well as the weekend before, and make sure to post your timezone. That way, if anybody does something they'll be able to work out when would be the best time to do it.

For me, I'm free 2:30pm-9:00pm Saturday, 8:30am-9:00pm Sunday and 4:30pm-9:00pm Monday, all times being GMT.