FREE FREE FREE. This event is brought to you buy City of San Marcos Parks and Recreation. On July 04, 2014, come to San Marcos Plaza Park for the Fourth of July! Live music by Cheryl Murdock and David Ybarra will lead up to a spectacular firework show at 9:30 pm. A children’s costume contest, activity area, and local vendors will be out on the lawn for you to enjoy. For information, visit their official web site http://www.summerfestsmtx.com/ or contact the City of San Marcos Parks and Recreation (512) 393-8400.