Talking about grand prix events like the ones here http://www.uschess.org/tlas/upcoming.php?CAT=GP#42252
Events that have guaranteed prizes, they can can award a number of Grand Prix points. At the end of the year, the player with the most Grand Prix points wins a prize.
https://en.m.wikipedia.org/wiki/USCF_Grand_Prix
Talking about grand prix events like the ones here http://www.uschess.org/tlas/upcoming.php?CAT=GP#42252