The official site for Google I/O 2016 is now live, and Google will begin accepting registrations for the event on March 8. If you are interested in the event, be sure to check out the new site, and be ready to register on March 8. In the past few years, tickets for the event have gone extremely quick, so you will want to make sure that you have your credit card handy all day to get your spot.
As for the event itself, it takes place May 18 - 20 in Mountain View, California. Google I/O is the company's annual developer conference in which it details some of the new features that are making their way to Android that year, and gives developers lots of hands-on time and seminars to learn.