user: Question: When was the game at Princes Park?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Footscray', '12.13 (85)', 'Richmond', '14.11 (95)', 'Western Oval', 14000.0, '5 July 1941']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Venue" = 'Princes Park';