Know how close the concert is to selling out

How it works

1. Set the concert's ticket target, the number you need to break even.
2. Record the total sold to date whenever you get a new count, before the show and at the door.
3. Members see the thermometer on the concert; you compare its curve with past concerts.

Under the hood

Each update is the total to date, so the latest one is always the count, and a refund simply records a lower total. Concerts line up on days before the show, not on calendar dates, so a December concert compares fairly with a spring one. Sales stay open 14 days after the concert for door sales and the final count, then the history is kept as it is.