Get your soil tested for free (heavy metals and nutrient levels) at the City of Austin Brownfields Office Soil Kitchen event on April 14 & 15 at Parque Zaragoza. Backyard gardeners, school, and community gardens are all eligible to bring samples! For details on how to collect soil samples: http://www.austintexas.gov/soilkitchen
If you’re there on Saturday, April 14, enjoy the East Austin Garden Fair (9am-2pm), which will be full of DIY and educational gardening activities: https://aggie-horticulture.tamu.edu/travis/local-extension-resources/east-austin-garden-fair/