Google just opened registration for its annual developer conference, Google I/O, which kicks off on May 15th and lasts through May 17th. The conference often sells out extremely quickly, largely because it’s an event where Google introduces the next version of Android, new hardware and sometimes even discusses fun side projects, such as Google Glass.

Tickets aren’t cheap, though. You’ll need to slap down $900 in order to reserve your spot.

Update: Looks like it’s already sold out, folks!