A weekend of improv performances and workshops! Performance by professional groups at Fairchild Chapel on April 19 starting at 6 p.m., workshops on April 20 in Bibbins (10 a.m. to noon) and Warner (4 to 6 p.m.), and performance by Oberlin's own improv troupes at the Cat in the Cream on April 20 starting at 8 p.m.