Slated to run from March 7-21, 2008, the Bunny Money event will be taking place on Lineage II servers:

On March 7th, adventurers all across Aden and Elmore will be able to travel to the curious shores of Fantasy Isle for free, where its diminutive inhabitants are hosting a special celebration event called Bunny Money. You can take part in the celebration by visiting Fantasy Isle to search for Treasure Boxes, or by hunting monsters for Treasure Sack Pieces. Participants will have a chance to win many valuable prizes! Check out the event page for all the details!

You can get the lowdown on the prizes to be had on the EVENT PAGE.