Hotdogs and hamburgers for softball tourney

I have been asked to cook hotdogs and hamburgers for a high school softball tourney. When I asked how many I should be prepared for, all she could say is that there will be 6 teams (girls). It will be about 8 hours long, but starts at 9, so most people will eat breakfast. Anyone have any experience on how to estimate the number of each I will need?

This is not a catering gig, only supplying the labor and grill. I don't need to know prices as they will be selling it.

That is what we are using, just wanted to make sure we get enough. Too much ok.

It is for the school so it is to help with expenses for the team. I will be reimbursed so I don't want to run out. I will probably donate 4 butts to make sandwiches too.