1601 Weld Road, Elgin, IL
Every Wednesday the Elgin VFW post 1307 opens it's doors to the public for Lightning Bingo. Bingo cards are $1 each, and you win 1/3 if the pot, PLUS a chance at $500.
Throw in cheap food ($2 burger, $2 beer), and you got yourself a weeknight. Also, funds benefit the VFW, which in turn benefits veterans and the community at large.
Plus, last time I won $30, so it's awesome.