With the WoW Classic 1.13.4 patch, Battleground Holidays will begin. Each of these lasts for about 4 days, during which players will earn additional Honor and Reputation in a specific Battleground. Battleground holidays start at 12:01 a.m. realm time:
Warsong Gulch: March 13, April 10, May 8, June 5, etc.
Arathi Basin: March 20, April 17, May 15, June 12, etc.