WWDC Together is a free place to watch and hangout during WWDC. We can now view upcoming and previous sessions via modern playback, with a chatroom for each session. Hope this provides a similar WWDC vibe.
I created an app for Apple's WWDC to allow developers and attendees to easily connect with each other using a QR Code. The goal is to make it easier to stay in touch with people you meet, replacing the need for business cards.