Choose whether to join a suitable instance or operate one for your community. Create a group with clear participation rules, publish a small event, and test the registration experience before promoting it to a broader audience.
Use privacy settings and participant roles deliberately, especially for events that should not be publicly discoverable. Federation can connect communities across servers, but it does not guarantee identical moderation or availability everywhere. Self-hosting requires updates, backups and an administrator who can handle membership and moderation issues.