I signed up for emails from this event when we planned to attend 2 years ago ( canceled, of course). Today’s email brought news of a ticket sale on through May 8. Not just for Moon & Stars, but also for other music festivals across Switzerland this summer. Might be worth a look.
https://corporate.migros.ch/de/engagement-freizeit/sponsoring/events/migros-ticket-festival.html
More information on Moon &Stars:
In German—I cannot figure out to change it to English so I hope others can.