Mobilizon is a privacy respecting, federated events management platform. I was given the link on Mastodon after asking if there are any alternatives to Meetup.
I have signed up and the process is really easy, the terms and conditions are also presented in a format that is easy to read / understand (big plus).
You don't need to sign up in order to say you are going to a meeting, another big plus for privacy etc.
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