Don’t let the size of this second-floor walk-up venue fool you. With its breakneck schedule, the Brick Playhouse is one of the region’s busiest little theaters. The Brick stages numerous festivals featuring anything from one-minute playlets to full-length productions and everything in between. The public can attend weekly cold readings of developing works. Two monthly programs, Guaranteed Overnight Theater, which takes a work from first reading to performance in 24 hours, and the All Sketch Comedy series, round out the schedule.