user: Question: Who was the visitor on October 20?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Decision', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['October 4', 'Chicago', '0 – 1', 'Minnesota', 'Backstrom', 18568.0, '1–0–0']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Date" = 'October 20';