How many members did attend the event 'Community Theater' in 2019?
event 'Community Theater' in 2019 refers to event_name = 'Community Theater' where YEAR(event_date) = 2019
SELECT COUNT(T2.link_to_member) FROM event AS T1 INNER JOIN attendance AS T2 ON T1.event_id = T2.link_to_event WHERE T1.event_name = 'Community Theater' AND SUBSTR(T1.event_date, 1, 4) = '2019'