Every visit, down to the day
Pick a group and a period, and you can see who was in when — broken down by a single day, a week or a whole season.

The app in use, recorded.
Arrival and departure times are kept to the minute. Pick a group and a period, and you can see who was in when — broken down by a single day, a week or a whole season, grouped by day.
Visits still open show up live: whoever is in the hall right now is marked out in the list.
When something went wrong
An arrival recorded by mistake is deleted with one tap. What remains is what happened — and every report counts from it, from attendance to the per-session fee.