This Friday & Saturday it's on. The Houston Area Arcade Group is holding the H.A.A.G. Expo. This expo is a fixed-cost one, where you pay for admission and then play all sorts of classic video games and pinball machines set to free play. Info is below:

Location: Holiday Inn Northwest (713-939-9955)
Time: Friday, June 4th (6:00 pm - until)
Saturday, June 5th (10:00 am - until)
Cost: $12 per day or $20 for entire weekend
(reduced cost for buying one in advance at above link)
List of Games That Will Be There