It may be related to the fact this year is a special edition: the 10th Google IO edition.
From the website:
"To celebrate a decade of working closely with the developer community, we’ll be hosting I/O in our backyard at the Shoreline Amphitheatre in Mountain View, CA, a venue that has played host to some of the world’s biggest entertainers and events."
From the website: "To celebrate a decade of working closely with the developer community, we’ll be hosting I/O in our backyard at the Shoreline Amphitheatre in Mountain View, CA, a venue that has played host to some of the world’s biggest entertainers and events."