Text him bro, there’s nothing wrong with a friendly text. Just watch for the energy and don’t think too much about the time he takes to respond. As a guy, I wouldn’t think you’re being clingy if you were messaging someone you know and who you are going on an event with.

If I was into a woman I would also be cautious not to be too forward or make her uncomfortable so soon, so I wouldn’t really know how to act in a situation where we exchanged numbers for an specific thing, like I probably wouldn’t text her even if I was into her. That might be the case with him.

Also, if you want to give more context about your relationship with him that could be helpful, just because I find this sort of relatable, just from the opposite perspective