When has a Centerfold model of krista kelly?
CREATE TABLE table_name_20 (date VARCHAR, centerfold_model VARCHAR)
SELECT date FROM table_name_20 WHERE centerfold_model = "krista kelly"
### Context: CREATE TABLE table_name_20 (date VARCHAR, centerfold_model VARCHAR) ### Question: When has a Centerfold model of krista kelly? ### Answer: SELECT date FROM table_name_20 WHERE centerfold_model = "krista kelly"