What are some alternatives?
When comparing Collaborizm and Eventbrite, you can also consider the following products
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Ticket Tailor - Ticket Tailor is an easy to use event ticketing platform that puts you in control.
Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform
Picatic - Picatic encourages event organizers to create a custom website, sell tickets and then determined their cost of use. Selling out events is easy with Picatic.