In San Francisco you have to be vaccinated at least once to participate in indoor events.

Basketball professional Andrew Wiggins threatens to miss his club Golden State Warriors in the North American professional league NBA in the home games because he is not vaccinated against the corona virus. The NBA informed about this on Saturday night.
In the city of San Francisco, where the Warriors have played their home games since 2019, proof of at least one vaccination against corona is required in order to be able to participate in indoor events.
Exceptions are medical or religious exemption certificates. The NBA has now rejected a vaccination exception for religious reasons for the 26-year-old. “Wiggins will not be able to play the Warriors home games until he meets the city's vaccination regulations,” the league wrote.
