I was reminded of this by another conversation, and figured that it might be helpful to share this with more folks.

In the Netherlands, some time ago, there was a housing protest. It was quite big and crowded, and most of the crowd - from diverse backgrounds, and without them having signed up before - was wearing a mask.

How we achieved that? By simply stationing a couple volunteers at the entrances to the park where the protest started, handing out masks from a big pile.

No further explanation, admonishments, requirements, questions, nothing. Just "here's a mask", one person after another, people didn't even have to stop walking to take it.

It really is that simple. Handing out the masks set a quiet expectation that people would wear them, and most people did. Some refused a mask because they brought their own; some people already put on their own mask as soon as they spotted the hand-outs from a distance.

I recall exactly two people actively refusing to wear a mask. Out of thousands.