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_19 ( air_date VARCHAR, rating VARCHAR, weekly_winner VARCHAR )

### Question ###
What is Air Date, when Rating is 'N/A', and when Weekly Winner is 'Wedding DJ Chris Dixon'?

### Accurate SQL ###

SELECT air_date FROM table_name_19 WHERE rating = "n/a" AND weekly_winner = "wedding dj chris dixon"