From September 29 - October 13 Ragnarok will be celebrating the Harvest Moon Festival!
Find the Yellow Kitty in the underwear in any of the main towns:
They want help collecting their Rice Cake Dough, from the "Hot Rice Cakes" running around. There are more Hot Rice Cakes on the Premium servers, but quite readily available on all servers!
Turn in enough Rice Cake Doughs, and you can get a tamer to get your very own Hot Rice Cake pet, who will help eat all your Green Herbs! Don't worry if your stat window disappears, if you put the pet away the information window will be restored.
You can also earn a Moon Rabbit Hat to truly memorialize the Harvest Festival! The pet eggs and Hats event items will be made tradable after the Harvest Festival is complete!