When were the callback auditions at Hilton Riverside Hotel held?
CREATE TABLE table_27455867_1 (callback_audition_date VARCHAR, callback_venue VARCHAR)
SELECT callback_audition_date FROM table_27455867_1 WHERE callback_venue = "Hilton Riverside Hotel"
### Context: CREATE TABLE table_27455867_1 (callback_audition_date VARCHAR, callback_venue VARCHAR) ### Question: When were the callback auditions at Hilton Riverside Hotel held? ### Answer: SELECT callback_audition_date FROM table_27455867_1 WHERE callback_venue = "Hilton Riverside Hotel"