Here is a clever and unique approach to event finding with your iPhone. ItsPoppingHere! (free) is a crowdsourced guide to what is going on around you. What's interesting is that all the events and reviews expire after 8 hours, so you know that all the local events you are finding are current. You can create a free account or use your Facebook login if you wish to suggest events or write reviews, and if you are "just looking" you don't even need an account.
Registered users can suggest events to share with others, and must be within 300 feet of the event to ensure that no fake reviews are being posted from those who are not attending.
You can find places to eat, events, clubs, parties and more. Every event you find is shareable on Facebook, Twitter and Google+.