Even though this is a freebie, it deserves its own separate post.

Over the past six years the Free Night of Theater program has introduced more than 250,000 new theatergoers to the thrill of live performance. This year tickets will be offered for performances from October 1-31. Tickets become available beginning in September. Register with the Free Night of Theater organization and choose a theater/play/date in your city.  Great deals in so many cities!