Here are some great alternatives to Eventbrite.
Sell tickets quickly and easily
Tito is built by people who run events, who know that software should not get in the way. In just a few clicks you can start selling tickets. No bloat, no fuss. https://tito.io
A lot of people also use http://www.meetup.com which has increased in popularity and is a good platform for posting events. Meetups areneighbors getting together to learn something, do something, share something
Get it happening! http://www.doattend.com