Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Ticket Tailor - Ticket Tailor is an easy-to-use event ticketing platform that allows event organizers of all shapes and sizes to sell tickets online.
Event Hunt - Startups and Tech Events Curated By Locals
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.