Hemisfair's Super Fun Saturday with H-E-B: Fiesta Fun Fiesta season is the best season in San Antonio, that’s why you're invited to Super Fun Saturday with H-E-B: Fiesta Fun! Join in to celebrate Month of the Military Child with Purple Up and kickoff Fiesta – Hemisfair style! Enjoy a day of free activities and entertainment for the whole family like maraca making, inflatable axe-throwing flower crowns, vendors, and much more! The Union Pacific Railroad Splash Pad will be open for you to cool off from the Texas heat!