User blog comment:Silicon Soldier/Sparrow Racing League/@comment-174.124.129.16-20151209004439/@comment-25916964-20151209030004

If you own Destiny: The Taken Kin, then you first visit Amanda Holliday to get the quest. You can then return to orbit, and select Sparrow Racing from the director. (bottom left corner). Unlisted requirements are probably having a sparrow and being above a certain level, given the high level gear on offer.