Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.

Laylo - Create fan reminders for events, content, and merch

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform

Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.

Zoho Backstage - Plan, run, and analyze your event— all from one place