1.The UF/IFAS Suwannee Valley Agricultural Extension Center near Live Oak offers a three-hour program to help farmers and homeowners learn to use open shade structures to extend vegetable production, 5-8:30 p.m. today. Registration is online at 2015shadeveggies.eventbrite.com. 2. The Gainesville Community Playhouse presents the adventures of Dorothy, Scarecrow, the Tin Man and the Cowardly Lion as they embark on a quest to find the Wizard of Oz, 8 p.m.