Database: student_club (difficulty: simple)
Question: Among all the Closed events, which event has the highest spend-to-budget ratio?
SQL: SELECT T2.event_name FROM budget AS T1 INNER JOIN event AS T2 ON T1.link_to_event = T2.event_id WHERE T2.status = 'Closed' ORDER BY T1.spent / T1.amount DESC LIMIT 1