Table schema:
CREATE TABLE table_name_26 (date VARCHAR, performer_4 VARCHAR, performer_2 VARCHAR, performer_3 VARCHAR)

Question: What is the date of the episode with Ryan Stiles as performer 2, Colin Mochrie as performer 3, and Tony Slattery as performer 4?
SQL: SELECT date FROM table_name_26 WHERE performer_2 = "ryan stiles" AND performer_3 = "colin mochrie" AND performer_4 = "tony slattery"