https://www.gamespot.com/articles/pokemon-go-may-2018-community-day-takes-place-tomo/1100-6459056/

May's Pokemon Go Community Day is nearly here. This month's event takes place around the world on Saturday, May 19, and those who participate will have a chance to get a special Charizard that knows a rare Fire-type attack.

As usual, the Community Day isn't centralized at a particular location, but rather during a specific window of time, meaning players can head anywhere to take part in the event. The Community Day runs for only three hours and begins at different times depending on which region you live in. You can find the scheduled hours for each region below: