Tired of listening to Lorewalker Cho’s stories on loop? Fashion Frenzy is not really your thing? Disappointed by your mount collection for Mount Mania? There’s an easier, and much faster way, to earn the 12 hour extra 10% buff which is earned by completing Celebrate Good Fun!.
Posted by NovastriderXL, it involves your favorite pet, a magic mirror, and some ball kicking around two grumpy notable Death Knights. The magic mirror can be found beside Petra at the pet area of the Anniversary Celebration. Kolthira Deathweaver and Lord Nessarian near the Fashion Frenzy stage are guarding the ball from dark forces.
So grab it under their nose while transformed into your favorite pet, do some kicking around, and get that 100% completion bar in a few minutes. Essenji also adds another pet mirror tip involving Zoomy Treats pet snacks which cause 
Zoomies.
You can also combine the ball and zoomy treats, and easily zoom your way to 100%. There’s more than a few between Petra and the Death Knight Ball Honor Guard.
So have fun in your pet form and get that buff fast!