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