This is how they handle C19 in Finland, this is a report from a health center, they dont close everything down like in the UK

Possible exposure to coronavirus at an outdoor concert
Individuals who have attended an open-air concert at the Summer Theater on Thursday, August 19, 2021 from 6:30 pm to 8:30 pm may have been exposed to a coronavirus infection.
Persons present are asked to monitor their condition for two weeks. If they develop symptoms suggestive of coronavirus infection, they should go to a coronavirus test. The test time can be booked from the health centre's appointment number