user: Question: When was Montreal a visitor?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Attendance', 'Record', 'Points']
Types: ['text', 'text', 'text', 'text', 'real', 'text', 'real']
Sample row: ['October 12', 'Montreal', '1–1', 'Pittsburgh', 10701.0, '0–0–1', 1.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Visitor" = 'Montreal';