All seriousness now, I think the best ones are the one's you can make up at the last minute. Like, if Kitty didn't buy season tickets, she could have had the RedsZone gathering in the Cheap Seats. Cyclone sat in scouts seats.
Or, just toss an announcement here. For instance say the following -
Hey, I'm headed down to the April 5th Businesspersons Special - anybody want to hook up and talk baseball or have soda/beer at the Machine room?
It's cool like that.
That way creek isn't stuck with a bunch of tickets.