Only two things I can remember concerning winning something Stones related was a baseball cap that came in the post about 2003 for winning something.
Also around 2003-2012 entered a draw to win a pair of tix for an LA gig I think and got a pair.
Only done it for fun and couldn't make the gig from U.K. so it went back in the draw to someone who could.
I think it was the gig where Bill Clinton spoke on stage.
Hopefully the winner of this trip to Miami is a poster or a browser on IORR and the setlist will be memorable as it is the last gig of this leg of The Tour.