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_name_56 (spectators INTEGER, date VARCHAR, time_cet_ VARCHAR)

### Question ###
Tell me the average spectators for 2006-06-21 and time more than 21

### Accurate SQL ###

SELECT AVG(spectators) FROM table_name_56 WHERE date = "2006-06-21" AND time_cet_ > 21