user: Question: If the Venue was Princes Park, which Date did the game take place on?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Melbourne', '13.17 (95)', 'Hawthorn', '21.5 (131)', 'MCG', 32527.0, '26 July 1969']
SQL:

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