Luma https://lu.ma/home
Pretty straightforward, feels like a lot of folks are using it these days.
Guild https://guild.host/
Events and community platform. Worth checking out. Hope it doesn’t move towards Meetup’s business model.
Partiful https://partiful.com/
Fun and simple.
Tito https://ti.to/home
Full-featured platform for managing events.
Eventbrite https://www.eventbrite.com/
Too many clicks and checkboxes to get things done IMO but a popular choice for events and seems to work for many.
Addevent https://www.addevent.com/
Add widgets to your site, event landing pages and a bunch of other features.