The Greatest Two Minutes in Sports is celebrating a major milestone: 150 years.The Kentucky Derby is this Saturday, and we have everything you need to know to prepare for the historic Run for the Roses.The racesThe Kentucky Derby is always the first Saturday in May, which this year is May 4. There are 14 races, which start at 10:30 a.m. The actual Kentucky Derby is race 12 at 6:57 p.m.Just prior to the big race, the contenders walk from the barn to the Paddock just after 6 p.m. The "Riders Up" call, which will be called by Martha Stewart, signals the jockeys to mount their horses.To see the full schedule, click here.The horses Here are the contenders as of noon Wednesday and their post positions. Note: When a horse scratches, their numbers stay the same, but they slide up a slot in the gate.DornochSierra LeoneMystik DanCatching Freedom Catalytic Just Steel Honor Marie Just a Touch Encino T O Password Forever Young Track Phantom West SaratogaEndlesslyDomestic ProductGrand Mo the First Fierceness Stronghold Resilience Society Man Epic Ride (will start in No. 20 post position)CHECK THE LATEST ODDS HEREHow to betBetting for the Kentucky Derby can be done online through TwinSpires.com or on their app. There's also information about how to bet and who the experts are picking. Click here for more information on betting.The purse: $5 million, the highest in history.Who's performing?National anthem: Kentucky native Wynonna Judd will sing the national anthemRiders up: Martha Stewart will do the honors of calling the Riders up!