user: Question: Before 1957, what was the largest in Attendance at Varsity Stadium?
Columns: ['Season', 'Date', 'Venue', 'City', 'Visitor', 'Score', 'Home', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'real']
Sample row: [1955.0, 'December 3, 1955', 'Varsity Stadium', 'Toronto , ON', 'WIFU All-Stars', '6-6 (tie)', 'IRFU All-Stars', 15088.0]
SQL:

assistant: SELECT MAX("Attendance") FROM "Table" WHERE "Season" < 1957.0 AND "Venue" = 'Varsity Stadium';