From the Meetup Page:
Ushahidi is a non-profit tech company that develops free and open source software for information collection, visualization and interactive mapping. Some of our products include the Ushahidi platform, Crowdmap and Swift River.
We encourage meet-ups to talk about deployments, design, development, policy and community capacity building. The Ushahidi team will organize events ranging from casual events, virtual events to larger topical events around the world. We will also work with you to provide outreach and potentially arrange local guests for your local meet-ups. Just drop us a line and we'll coordinate.
It seems that most of the meetups are virtual, but there's about 600 members in the Atlanta Ushahidi meetup, and they seems to do physical meetups occasionally.