user: Question: what's the date with attendance being 40657
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Record', 'Game Site', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 21, 1975', 'at Chicago Bears', 'W 35–7', '1–0', 'Soldier Field', 54152.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Attendance" = 40657.0;