* Add event date fields, add preliminary range check
* Remove function, use filtered queryset for subevent id limit
* Improve and fix date range check
* Add formfields
* Add tests
* Improve tests
* Add new fields to API and documentation
* Add migration
* Change description according to suggestion
* Change discount apply signature, remove unnecessary query
* Rename new fields, simplify range check
* Rename fields in template
* Apply suggestions from code review
Co-authored-by: Raphael Michel <michel@rami.io>
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Co-authored-by: Raphael Michel <michel@rami.io>
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