"Dare to dance with these icons inspired by the Masquerade event going on throughout Latin America and Brazil.
They’re available for 250 RP or 1500 IP each through March 7. "
They are available for NA, EUW, EUNE , TR, RU, and OCE.
Remember: LAN, LAS, and BR have their own, unique Masquerade events going on.
[Update] A beautiful promotional site for the LAN/LAS and BRMasquerade events has been posted!
Check it out for more info on the region specific events!