Google I/O is a huge day for Android, and this year the event will happen about a month later than usual, on June 27th until the 29th. Even with the event happening a moth late you can still register very soon. Registration will be open on March 27th, and the price has certainly increased from last year.
To attend Google I/O it will cost you $900, which is double the price last year. Students will pay triple the price they paid last year, by paying $300 this year.
Be ready on March 27th to register because last year the event sold out in less than an hour.