TicketHarbor - The safer Craigslist for P2P ticket exchanges
TechEvents.co - Tech and startup events aggregator
Up All Night - Concerts and exclusive events for $25 a month
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Sporteventus for iOS - The worldwide search engine for sporting events and tickets
Facebook Local - Discover places to go and events happening near you