Earlier today, Google sent developers on a wild scavenger hunt with five puzzles, eventually revealing the location to Google I/O - the Shoreline Amphitheatre in Mountain View, California.

Assigning the name of the countries to positions on a chess board, while adding/subtracting from the letter values provided "L IN E THEATRE SHO RE AM P H I." This is the Shoreline Amphitheater in Mountain View, CA. All of this was figured out by a Discord channel dedicated to solving the puzzle - so props to them for figuring it out. They also found out the most likely date for the event - May 17-19.

We will likely get official details from Google soon, but if you're heading to I/O, you should stock up on sunscreen.

Thanks: Everyone on Discord for figuring this out