A complete ticketing solution for Störtebeker Festspiele in Ralswiek, Germany: https://stoertebeker-karten.de/
This is a huge topic since it includes amongst others
- a webshop with online payments
- fully-featured administrative UI for booking offices (barcode reader functionality video)
- entry controlling software: video 1, video 2
- ticket printer software
- POS terminal programming (cashier’s desk)
It was a complete greenfield project built from the get-go, closely working together with colleagues from the theater, and is still being maintained and new features developed.
A couple slides are available, that were presented at a Django Meetup in Berlin.