Calculate the amount budgeted for 'April Speaker' event. List all the budgeted categories for said event in an ascending order based on their amount.
'April Speaker' is an event name; amount budgeted refers to budget; budget categories refers to category
SELECT SUM(T2.amount), T2.category FROM event AS T1 INNER JOIN budget AS T2 ON T1.event_id = T2.link_to_event WHERE T1.event_name = 'April Speaker' ORDER BY T2.amount