user: Question: When was the game played at Lake Oval?
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', '13.10 (88)', 'Richmond', '13.21 (99)', 'Glenferrie Oval', 19480.0, '16 August 1969']
SQL:

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