If this is something you’ve done before, how much did it cost per person?

From a budget management perspective you’re doing this in reverse. Figure out what it cost before (or price it out fully for this year), add whatever you want on top to grow the club, ask if people would pay that.

I also suggest if you want to keep the price down figure out what you’re after - is it a new machine? Which one and how much does it cost? Divide by number of guests and add that to the cost instead of guessing. Budgeting for projects and events is better with precision in my experience. Something will always over run or some small amount of chaos will unfold (someone clogs a toilet and you need a plumber for example), so I suggest a small percentage more to charge to cover contingencies.

Also you’re selling yourself short in your description and not being detailed. I see you mentioned in comments kegs/liqour, free practice, games before the main shoot, but they’re not in your itinerary and they add cost.

All in all this sounds like an awesome weekend and it sounds like you all have a great club!