What percentage was the budget for Parking to the total budget for the "November Speaker"?
DIVDE(SUM( amount where category = 'Parking' and event_name = 'November Speaker'), COUNT(event_name = 'November Speaker)) * 100
SELECT CAST(SUM(CASE WHEN T1.category = 'Parking' THEN T1.amount ELSE 0 END) AS REAL) * 100 / SUM(T1.amount) FROM budget AS T1 INNER JOIN event AS T2 ON T1.link_to_event = T2.event_id WHERE T2.event_name = 'November Speaker'