I'm used to being the only person at in-person events who's wearing a mask.
But this afternoon, the person who sat down next to me and introduced herself then said "Would you prefer that I wear a mask?" and got one out of her bag.
And when I next turned toward the person on the other side of me, he'd just put on a mask too! He didn't ask about it and probably thinks I can see less than I do so isn't expecting a medal for this.
This made my day; I was so impressed.
At the end of the day, I saw one of these people milling around the room chatting while having the mask on her arm like a bracelet, so she clearly thought it was only necessary while she was in proximity to me, which is disappointing but it's still better than nothing.