Two months ahead of the event itself, Google has opened up registration for its annual Google I/O developer conference, requiring those that want to attend the three-day event to sign up using their Google+ account. Starting at $300 for academics and $900 for general attendance, tickets aren't cheap, but attendees are almost certain to walk away with a huge haul of devices, if last year is anything to go by.

I/O will commence on May 15 through to May 17 at the Moscone Center West in San Francisco. It's set to feature Google's latest Android and Chrome OS updates, as well as the company's other hardware and software developments. We also hope to see more on Project Glass, following Google's SXSW briefing earlier this week.

Tickets sold out in 20 minutes last year

Last year, Google unveiled the Nexus 7, the Nexus Q streamer, Android 4.1 Jelly Bean, and a memorable live demonstration of Project Glass by Sergey Brin. Tickets for the event sold out in record time (in around 20 minutes) last year, so be sure to have signed into your Google+ account — a necessary part of the registration process — before attempting to purchase your ticket.

Update: Google is now showing that tickets have sold out and that registration has been closed, nearly an hour after sales began.