I think it refers to the Race Track where players have to run through obstacles on couple different maps.
Somewhat similar to original Swordman Job Change Quest.
This event is something that Nobba use to have, where players get to run through tiny block of woods, through sand that gives random freeze / sleep / curse status, invisible wall (just like Assassin Job Quest) and then at the end of the 7+ maps they will get the rewards on a map where every winners will be able to see each other and normally sitting around and just randomly chatting.
After couple mins the finish line will close and only players who reached the finish line get rewards.
