Change Details

* [x] Add ability to change primary event organiser * [ ] Add ability to add other users to the event for creation purposes (form needs backend implemented) * [ ] Change relevant access checks on organiser * [ ] Audit logging for organiser change?

* [x] Add ability to change primary event organiser * [x] Add ability to add other users to the event for creation purposes * [x] Change relevant access checks on organiser

* [x] Add ability to change primary event organiser * [ * [x] Add ability to add other users to the event for creation purposes (form needs backend implemented) * [ * [x] Change relevant access checks on organiser * [ ] Audit logging for organiser change?