On Galveston Island, the festival scene is more than a single-season affair. Summer is a popular time to visit the Texas island, pulling crowds to beautiful beaches and sand dunes around its 32-mile coast. But ask the locals, and they’ll tell you that a vibrant public life can be found year-round here, thanks to sunny, mild temps keeping the social calendar busy in any season. Galveston’s storied history, as both a busy immigrant port and the birthplace of Juneteenth, certainly sets the festival stage. On top of that, it seems…