https://www.mercurynews.com/2022/04/21/san-mateo-nearly-90-students-test-positive-for-covid-19-after-prom/

SAN MATEO – Nearly 90 San Mateo High School students have tested positive for COVID-19 after attending prom earlier this month, according to school officials.

The school held its prom April 9 at the Asian Art Museum in San Francisco. As of 11 a.m. Thursday, about 90 of the nearly 600 students who attended the event had tested positive for the coronavirus disease, said San Mateo Union High School District spokesperson Laura Chalkley.