Gathio

Gathio is a simple, free and open source, federated, privacy-first event hosting platform, for creating ephemeral, hidden events, with self-hosting options.

There are no accounts: upon creating or joining an event, a password is generated which can be used to edit the event, optionally being sent by email. By default, events are automatically deleted 7 days after they end. Gathio federates with other instances and services using ActivityPub.