Today I was going through some of the Club Penguin Stamp files when I saw it referenced an unreleased stamp. Take a look:
The stamp will be called Snowboarder, the stamp id is 440. The party will be over around September 1st or 2nd. In order to unlock this stamp you’ll have to wear any of the two new Snowboards from the clothing catalog. There is also a third item referenced, most likely a third snowboard which will be at the party as a free item, and probably for members. The rooms you’ll be able to unlock this stamp are the Town, Plaza, Ski Village, and all 10 of the rooms specifically for the party. Awesome!