This weekend, hundreds if not thousands of families will head north on Interstate 75 for commencement ceremonies at the University of Florida, where 11,000 Gators from 49 states and 105 countries will walk the stage today through Monday. At the same time, get ready for a flood of graduates’ families to hit Tampa Bay, too. Commencement ceremonies for the region’s public school systems, universities and colleges kick off Friday and stretch into mid-June.