Don't miss the Slay the Runway kickoff party at Firehouse Art Center in Longmont. Left Hand Laughs6:30-8 p.m. Thursday, May 29, Left Hand Brewing, 1265 Boston Ave., Longmont. Organic Plant Exchange9 a.m. to noon, Saturday, May 31, Unitarian Universalist Church (west parking lot),5001 Pennsylvania Ave., Boulder. “We’ll have plenty.”Youth Behind & Beyond Bars7-9 p.m. Saturday, May 31, Boulder Public Library - Canyon Theater, 1000 Canyon Blvd. FreeTeach your own little duckling about the wonders of life at the George Reynolds Branch of the Boulder Library through this series in partnership with 4-H Boulder County.