Mobilizon is a Fediverse platform for organising events. You can find out more from their official website at:

➡️ https://joinmobilizon.org

Their official account is:

➡️ @mobilizon

Organisers can create accounts on existing Mobilizon servers, or start their own server. They can then create event info pages where participants can sign up.

Mastodon users can follow Mobilizon accounts to be notified about new events (for example @peppi_guggenheim_live_music is a Mobilizon account in Berlin).