Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_27455867_1 (callback_audition_date VARCHAR, callback_venue VARCHAR)

### Question ###
When were the callback auditions at Hilton Riverside Hotel held?

### Accurate SQL ###

SELECT callback_audition_date FROM table_27455867_1 WHERE callback_venue = "Hilton Riverside Hotel"