Chicago is at peak improv, with iO Fest and TJ & Dave returning

Chicago is at peak improv at the moment. This weekend marks the third annual iO Fest, which is one of the biggest improv events in the world. Next weekend, improv legends TJ & Dave perform at the Goodman Theatre. Then, in August, the Dramatic Improv Festival arrives, heralding a unique brand of the artform. So if it feels like improv is everywhere this summer, it is. “When I first started, there weren't any real improv festivals,” said comedian TJ Jagodowski. He’s set to perform July 30 - Aug.…