The upcoming holiday weekend in horse racing is annually one of the busiest on the calendar, and this year will be especially exciting as both Saratoga Race Course and Del Mar will have fans in attendance for the final days of their summer meets. Two Breeders’ Cup “Win and You’re In” races are on tap, both set for Saturday, Sept. 4 at Saratoga, and important 2-year-old races will follow at both tracks on Sunday, Sept.