It is bugged... if you have two people or less in the event. I tested it... when I was alone and when I was with another person. You don't get the prize, and the npc would not appear out in the open. I had to warp back to Prontera ><. That was my first time winning the event, too T_T XD. If you get three or more players, the event works... and you get the prize =D. I hope this bug can be changed soon... for other people.