If you aren’t familiar with Band, it’s a tool often used for coordinating kids’ sports teams, school bands, and similar small groups. You invite people to a private workspace which contains a post feed, events calendar, file repository (for permission forms or injury waivers or whatever), and a chat interface for 1-on-1 or group chats among workspace members.

Is anyone familiar with a similar tool that can be self-hosted?

My kids’ groups have tried using a mix of chat/SMS, email, and Google Drive in the past, but fractured communication leads to massive confusion. It’s really nice to have all group communication in one place.