user: Question: What is Date, when Attendance is less than 521?
Columns: ['Date', 'Home', 'Score', 'Away', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['16 November 2008', 'Hispano', '2:3', 'Real Espana', 1059.0]
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Attendance" < 521.0;