Question: When was the callback audition date for the audition city from the episode aired on February 2, 2011?
Schema: create table table_27455867_1 (callback_audition_date varchar, episode_air_date varchar, PRIMARY KEY (callback_audition_date))
SQL: select callback_audition_date from table_27455867_1 where episode_air_date = "february 2, 2011"