TicketHarbor - The safer Craigslist for P2P ticket exchanges
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.
Sporteventus for iOS - The worldwide search engine for sporting events and tickets
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Up All Night - Concerts and exclusive events for $25 a month
Meetup for iOS and Android - Discover groups that are all about the things you love