Karrot is a free and open-source tool for grassroots initiatives and groups of people that want to coordinate face-to-face activities on a local, autonomous and voluntary basis.
It is designed in ways to enable community-building and support a more transparent, democratic and participatory governance of your group.
Is this a self-hostable platform? I just see a signup option.
Yes, I linked the documentation on that elsewhere in this thread.
Just before your post about Karrot I finally (re-)installed Agora on Yunohost as a collaboration suite. First few users onboarded and praying it works. It’s a bit ugly but does the job. Karrot looks to be more map-focused than Agora from a very fleeting look, I don’t think I’ve seen it in the Yunohost catalogue.