If you’ve never seen improv comedy, you might be prejudiced by that open mic night when some poor schmuck’s dick jokes fell flat, yet you felt obligated to laugh. Not so at Mad Cowford shows: The improv troupe draws consistent, high-energy crowds every weekend night to their Northstar Substation digs ($5 gets you in). A loyal audience returns week after week to participate in their sketches, scenes and games. The group celebrates eight years performing here with the comedy revue variety show Way Off Broadway. 8 p.m. July 19, Theatre Jacksonville, $20, theatrejax.com, madcowford.com.