Discover how the XP and Reputation Buff will work during WoW’s 20th anniversary event in Patch 11.0.5!
During the anniversary, all players automatically receive the WoW’s Anniversary buff, which grants a 10% boost to Experience and Reputation gains.
But that’s not all! Completing the Celebrate Good Fun daily quest rewards you with 
Blessings of the Bronze Dragonflight. This stacks with the main buff, giving an additional 10% XP and Reputation increase for 12 hours.
In total, XP and Reputation gains during the upcoming anniversary event will be increased by 20% for 77 days!