One of the most affordable and most enjoyable activities off the typical San Francisco event radar is attending a USF basetball game. The War Memorial gym is an old school gymnasium, where spectators are *very* close to the action. USF was the first basketball team west of the Mississippi to finish the season ranked #1, and some of the greatest NBA players are USF alumni. The Bill Russell room alone is worth the trip, but the aura of all of the other greats that played at USF make this a surprisingly fun night out.
Pros: fun, cheap, the seats are close to the court
Cons: the USF teams are good but not great; attend WCC conference games