https://www.siliconvalley.com/2020/03/11/gov-newsom-calls-on-all-events-with-more-than-250-people-to-be-canceled-due-to-coronavirus-concerns/

Gov. Gavin Newsom called on all events with more than 250 people throughout the state to be postponed or canceled, at least until the end of March, because of concerns about the new coronavirus, his office announced late Wednesday, March 11.

Smaller events, his office said, should proceed only if the organizers can implement social distancing of 6 feet per person. And for people who are at higher risk for severe illness from COVID-19, events should be limited to no more than 10 people, his office said, while also following social distancing guidelines.