Last night’s SummerMash was a blast. The Web 2.0 gurus threw a huge party at the Grand Hyatt for anyone and everyone in social media and tech. The Eventbrite team helped with entry management—using our check-in app on iPhones and iPads—and attendees got to sample hosted food and drinks, chat it up with bigwigs like Pete Cashmore, and grab cool prizes from event sponsors. PR firm and tour sponsor Weber Shandwick offered cupcakes and the chance to win airline tickets and iPhone accessories, Gotelo entered every attendee who registered for their site in a drawing for an iPad, and Bing sponsored the Polite in Public photobooth that was a huge attendee hit. The space was huge, and although there were well over 500 attendees there was plenty of space for mingling.