Dale Curtsinger organized the protest, saying there isn't any rule "where it says you cannot sing and dance." People who attended the concert held up signs that said 'Music Matters'.
Source: NBC San Diego
One of the biggest punches to the gut since isolation and social distancing began is how many concerts had to be cancelled or postponed. Now, I can't do anything about Tool pulling the plug on their May 5th Van Andel show, however, I can try to sate your fix for live music.