Fiesta players are invited to a Gangnam dance off to celebrate the international sensation popularized by South Korean singer, Psy. From September 19th to 24th, server populations are invited to try out the latest Fiesta dance, Roumen Style, and attempt to break the Guiness World Record. 

From September 19 through September 25 at 4pm PT, each server in the game will get their chance to assemble the largest number of players ever to simultaneously perform the same dance in the history of the wildly popular free-to-play anime fantasy MMORPG. The whole event will be recorded, fans will get a chance to have their mashups featured on Facebook, and the winning server will enjoy a free weekend boost.

Read more details on the Fiesta site.