nope there were definitely multiple graduation ceremonies. I live in Gainesville and dealt with traffic all weekend surrounding campus. Not sure if links work here but, https://commencement.ufl.edu/schedulespring2018

How the heck would they prove that it was the family? If you've got thousands of graduates and thousands of people in the hall, how do you prove the clapping for Joanna Michaels was done by family, friends, people she knows or it might even be people she doesn't like?

My son's school did a good job with it. The student's name was announced before they entered the stage so the cheering, etc. was going on while they were walking to get their diploma holder, not after. It was done in time for the next name to be announced and the "celebratory" goofiness happened as they were leaving the stage, out of the way. It worked out very well. There was a family with an air horn which was ridiculous and a handful of grads were goofy the whole walk, but it wasn't many. None "strolled".