CREATE TABLE table_name_19 (air_date VARCHAR, rating VARCHAR, weekly_winner VARCHAR)

What is Air Date, when Rating is 'N/A', and when Weekly Winner is 'Wedding DJ Chris Dixon'?
SELECT air_date FROM table_name_19 WHERE rating = "n/a" AND weekly_winner = "wedding dj chris dixon"
SELECT "air_date" FROM "table_name_19" WHERE "n/a" = "rating" AND "wedding dj chris dixon" = "weekly_winner"