Pretty simple, you put a filter up - part of a requirement for entry is a clear antigen test. Once a clear result is detected a QR code is sent to your phone and its scanned on entry with your ticket. Its asymptomatic people you want to catch with this.
Its happening all over Europe now, at any events or big nightlife area, they have kiosks where you can get an antigen test for a euro, once the positive test comes back in three mins you are sent a QR code to your phone that lasts 24 hours and can get access to pubs, restaurants, gigs etc and its game on. Thus eliminating any potential transmission as best you can. Its working all over most of Europe at the moment, it just needs to be copied.
See i would see the above as keeping these industries safe and open with an appropriate safeguarding strategy opposed to just being blind, letting everyone in, spiking cases and closing eventually, this is mitigation and "living with Covid".