Database: student_club (difficulty: simple)
Question: List all the members who attended the event "Registration".
SQL: SELECT DISTINCT T3.member_id FROM event AS T1 INNER JOIN attendance AS T2 ON T1.event_id = T2.link_to_event INNER JOIN member AS T3 ON T2.link_to_member = T3.member_id WHERE T1.event_name = 'Registration'