How do I limit each ride on my form to 20?

Attached is print screen of our form 2019 Reg. Jamb with a drop down that I want to use for ride selections.  I would like to be able to count down the number of rides to a maximum of 20 riders. See notes on attached print screen images. 

I noticed a gift registry (see second print screen) that is what I want to do, but I prefer a drop down as there are so many rides to chose from.  Can this be done?

Tri-State ATV Club

Unfortunately, we do not have any widgets that can limit the selection using drop down. You may use Gift registry or Ticket Purchases to limit the number of rides. 

Let us know if you need any further assistance. We will be happy to assist.