So I picked up the phone and called "Coach Brett's".
Me: "Yes, I want to schedule my daughter's birthday party, but here is the catch, Coach Brett has to be there... yes, I understand his schedule is busy... yes, we will come whenever he is available... yes, just tell him that it is for Skadi and that we are EXTREMELY flexible... yes, call me back after you talk to him..."
Success. Coach Brett would be there as long as I could plan the party for this time on this date.
I agreed and sent in our deposit.