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_21536557_2 ( day VARCHAR, stage VARCHAR )

### Question ###
Which days have a stage of ss11?

### Accurate SQL ###

SELECT day FROM table_21536557_2 WHERE stage = "SS11"