Chalk one up for Artpace and their colorful, urban, Houston St. festival. San Antonio’s premier artists turn the sidewalk into a gallery of temporary chalk masterpieces that includes a super-size public mural that all passersby are invited to work on. The beat of local DJs complements crafty street-side shopping and Kidzone creation stations for the kids. Free, 10am-5pm, Downtown Houston Street, (210) 212-4900.