The event is called PennApps Mobile, hosted by the Dining Philosophers at UPenn's Computer Science Interest Group, which will take place in Philadelphia from Friday to Sunday afternoon. The focus of this year's event is on mobile development, with demos and tutorials covering various APIs and SDKs. Teams will have a chance to present their projects and compete for prizes, including a Nexus S smartphone. Twilio is a proud sponsor of the event, providing API demos and support.