Mark your calendars for the 13th Annual Earth Day San Marcos Festival, returning to Spring Lake on Saturday, April 18, 2026! This FREE community-wide, family-friendly event is your opportunity to celebrate our local natural resources and connect with nature. Enjoy a variety of hands-on educational activities for all ages, along with live performances and demonstrations. Don’t miss the chance to interact with eco-friendly exhibitors and vendors showcasing a range of environmental and sustainability-related topics. Join us at the headwaters of the San Marcos River and experience a day of fun, entertainment, and learning. We can't wait to see you there!