Lineage2.com:
Adventurers' Guides and Event Gatekeepers are back in the towns of Aden and Elmore to help new and veteran players experience Interlude.

From April 11 to 24, all players can take advantage of special event teleport locations, and characters under level 25 can receive special weapons for no charge from April 11 to May 8.

More information about the event can be found here