Database: student_club
Question: What are the budget category of the events located at MU 215 and a guest speaker type with a 0 budget spent?
SQL: SELECT DISTINCT T2.category, T1.type FROM event AS T1 INNER JOIN budget AS T2 ON T1.event_id = T2.link_to_event WHERE T1.location = 'MU 215' AND T2.spent = 0 AND T1.type = 'Guest Speaker'