SARATOGA SPRINGS, N.Y.-With the mighty successful prelim--the GI Belmont Stakes--now part of Saratoga's storied history, it is time to move on to the main event. The 40-day racing season, the 156th since the first meet was staged in 1863, commences Thursday with an 11-race program at Saratoga Race Course, America's oldest sporting venue. The listed six-furlong $175,000 Schuylerville S., a graded stakes for 2-year-old fillies through last year, is the traditional opening-day feature. The first post is at 1:10 p.m. By the time the meet concludes on Labor Day, Sept....