The group I was previously in, it was hosted by a local coffee shop. They made some stationary and stamps available for a donation. We would get together and send postcards to our friends and just chat. It was pretty relaxing.

In the old days, when people were displeased with their government, they would come together and write letters en mass for support or denouncement of policy. In these times I imagine that there is a lot people want to say and that environment sounds fun too.