For others looking: https://openstreetmap.community/ lists local groups and chapters on a map. (Not to be confused with https://community.openstreetmap.org/)

The OSM chapter in my own town was organized by a startup that provided map-related solutions. When that startup got acquired and its employees were all transferred to the parent corporation’s office several countries over, the chapter sadly disappeared overnight. I miss it.

Those employees really got the shaft in that acquisition.

They moved from a small Eastern European city to a Western European one that was popular with hipsters, and they got a significant pay rise. None of them were displeased about it, and the ones I am still in contact with are happy there and do not intend to move back.