With the news that Meetup.com has been swallowed up by Bending Spoons (with a track record of strip mining good tools to their doom), a #fediverse alternative to explore is Mobilizon @mobilizonhttps://joinmobilizon.org/en/
@andypiper@django@mobilizon I think @linos (?) are working on extending/developing the wordpress activitypub plugin to be able to add events which are comptible with mobilizon etc