user: Question: Who is the visitor on the date December 31?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Record']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['December 3', 'Calgary', '2 – 5', 'Detroit', '15–9–3']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Date" = 'December 31';