Boerne BOO! at Patrick Heath Public Library is a free, family-friendly fall festival held at the library in Boerne. Think seasonal fun for all ages, with arts and crafts, trick-or-treating, bounce houses and carnival games. Food trucks, music, candy and prizes add to the fun, and a costume contest offers prizes in several categories, including a Pets category. It's a cozy, community-style way to celebrate the season with the whole crew.