Here’s a super simple app I made for staff to sign up for training. Due to ‘social distancing’ each time slot can only accommodate up to 5 people, so I used a Rollup to prevent booking once that number of people sign up.
I hope this app helps others understand the Rollup function — it took me some time to wrap my head around it, but the way I’ve used it in this app works exactly how I need it to. The app is available to copy and is based off @Jeff_Hager’s and @Robert_Petitto’s previous work on bookings and rollups.
FYI - I also created an Admin version of this app where the trainer has a list of people who signed up and can easily mark the training as completed (per sign-up) once it’s over.