This marks the fifth straight year Gronkowski has shaved his head at the event, and the sixth year in a row that he's been part of it.
"This is just an unbelievable event," Gronkowski told the crowd as his hair was getting buzzed. "Just seeing kids, what they're going through, puts a feeling in you that you want to help them out. You want to raise awareness for all the kids going through the hard times, the struggles, to know that there's someone there at all times for them."
Afterward, he told reporters, "It's an honor to be here. Every single year, I put it on my calendar, to make sure I'm here at the event. It's always a blast."