A strong double bill opens with This Day in History, a sketch show rewritten each week around news linked to the month and day of the performance--such as a magnificent hailstorm in Nebraska on July 6, 1928. Written, performed, and directed by four siblings--onstage are Pat O'Brien and Meagan O'Brien Flanigan, who are savvy enough to pull off this form--it occasionally conjures childhood adventures borne of boredom, but the bits are smart and accessible. Michael Lehrer's 80s-influenced one-man show Heartbreaker is an entertaining parade of pathetic characters, like an unskilled magician and a delusional speed walker. It ends with a hilarious video of Lehrer getting pummeled at an actual underground boxing match. --Ryan Hubbard a Open run: Fri 10:30 PM, iO, 3541 N. Clark, 773-880-0199, $14.