user: Question: What Date is Northern Spur Breeders' Cup Stakes Race?
Columns: ['Date', 'Track', 'Race', 'Distance', 'Purse ( US$ )', 'Surface track', 'Winning horse', 'Winning jockey']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['January 1', 'Calder Race Course', 'Tropical Park Derby', '1⅛ Miles', '$100,000', 'Turf', "Soldier's Dancer", 'C. Velázquez']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Race" = 'Northern Spur Breeders'' Cup Stakes';