user: Question: When was there a crowd larger than 23000?
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', '21.10 (136)', 'Melbourne', '14.20 (104)', 'Glenferrie Oval', 13186.0, '3 May 1969']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Crowd" > 23000.0;