user: Question: On what date was a game played at MCG?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Collingwood', '9.15 (69)', 'Fitzroy', '21.23 (149)', 'Victoria Park', 29345.0, '7 April 1979']
SQL:

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