Pokémon GO has announced its next Season’s Community Day schedule, with events set for Dec. 12-13, Jan. 16 and Feb. 6, plus a Community Day Classic on Jan. 2. Other confirmed dates include a Max Battle Day on Dec. 5, Raid Day on Dec. 19, Hatch Day on Dec. 26, Super Mega Raid Days on Jan. 9 and Jan. 30, another Max Battle Day on Jan. 23 and a Raid Day on Feb. 13. More details, including information about December Community Day, will be announced later.
Source: Official Pokémon GO blog