I'm confused. Do I wear a mask or not?

Friday night I attended what was, I believe, the first Gotham meeting in a very long time. I walked in with a mask on but out of the 35 or so people attending, i was one of three who wore one.

It was outdoors, but personally, I was a bit nervous. I am vaccinated but still carry some fear with me whereever I go. So I wore the mask for most of the time. When I ate I took it off and kept it off till I left.