Milofy - Socialize with other like-minded couples
TechEvents.co - Tech and startup events aggregator
Text Event Pics - Text a number to store and share photos together
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Facebook Local - Discover places to go and events happening near you