Database: student_club
Question: List all the names of events that had an attendance of over 20 students but were not fundraisers.
SQL: SELECT T1.event_name FROM event AS T1 INNER JOIN attendance AS T2 ON T1.event_id = T2.link_to_event GROUP BY T1.event_id HAVING COUNT(T2.link_to_event) > 20 EXCEPT SELECT T1.event_name FROM event AS T1  WHERE T1.type = 'Fundraiser'