When was Kalin Olson listed as  the centerfold model?
CREATE TABLE table_1566850_8 (date VARCHAR, centerfold_model VARCHAR)
SELECT date FROM table_1566850_8 WHERE centerfold_model = "Kalin Olson"
### Context: CREATE TABLE table_1566850_8 (date VARCHAR, centerfold_model VARCHAR) ### Question: When was Kalin Olson listed as  the centerfold model? ### Answer: SELECT date FROM table_1566850_8 WHERE centerfold_model = "Kalin Olson"