Given that a lot of US-based FTers do international runs on 3-day holiday weekends, that September 14 weekend is probably your best choice. We've had events in 2005 and 2006 which were loosely tied to watching the Cubs lose to other teams, and the turnout has been around 25 people each time. But I think $82 might be out of most people's price ranges for a game for all but the most hardcore baseball fans or the most hardcore drinkers.

Good luck with your planning!!