https://arstechnica.com/gadgets/2020/01/google-io-2020-set-for-may-12-14-at-shoreline-amphitheater/

The dates are set for Google I/O 2020—Google's biggest show of the year will take place on May 12-14. As usual, the show is at the Shoreline Amphitheater, an outdoor venue located right next to Google's Mountain View headquarters. Google announced the date through a cryptic command-line-driven space game at events.google.com/io/mission/. There is also this tweet:

— Sundar Pichai (@sundarpichai) January 24, 2020