Call your local gamestop/ebgames or bestbuy for special Bioshock 2 activites tonight only
I can tell you though gamestop at Citywalk isn't do anything so don't head there. Call ahead to your local video game retailer
Midnight Bioshock launches at Gamestop will have
An ADAM scavenger hunt
Big Daddy skirt up contest
BioShock anything insubstantial challenge
ADAM esteem drawing