Niantic have announced the details for the 5th Pokémon GO Community Day which takes place on May 19th, 2018 at 2:00 PM until 5:00 PM Haiti Daylight Time. The featured Pokémon for this day is Charmander and a Charmeleon that evolves into Charizard during this time will learn the move Blast Burn. The 3× Catch Stardust and 3-Hour Lure bonuses will also be available that day.
Source:
https://pokemongolive.com/events/community-day/