user: Question: What date was the game played 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: ['Hawthorn', '11.16 (82)', 'Richmond', '17.12 (114)', 'Princes Park', 13574.0, '21 August 1976']
SQL:

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