Mayan priests took it upon themselves to inform the people of important matters such as festivals, harvest updates and when the next Quidditch tournament will be held - the same can be said about Google I/O just without the headpieces. Attendees are given the 411 on the latest announcements and newest products that have just or is about to hit the market.
Android updates can be hard to follow since Google’s updates depend on a lot of factors outside of the company that ultimately delay releases. Google’s I/O conference is the best chance we have to see what’s coming to Android from the offices of its core designers.