Based on our record, Mobilizon seems to be more popular. It has been mentiond 6 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
For anyone looking for a non commercial option, https://joinmobilizon.org/en/ has made some great improvements lately. - Source: Hacker News / 5 months ago
Framasoft is also involved in the development of Mobilizon, a decentralized and federated alternative to Facebook Events. Source: about 1 year ago
Framasoft is also involved in the development of Mobilizon, a decentralized and federated alternative to Facebook Events. Source: over 1 year ago
Not sure it covers all your requirements, but have you looked at Mobilizon (meetup.com alternative)? Source: about 2 years ago
Meetup is alive, but it is more or less as you say, the groups has cost (normally the people from a group paid together). There is a free software alternatives (but I don't know if there are good servers with a lot of people and groups running): https://joinmobilizon.org/en/. - Source: Hacker News / about 2 years ago
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