CREATE TABLE table_62370 ("Date" CLOB, "Series" CLOB, "Circuit" CLOB, "City / State" CLOB, "Winner" CLOB, "Team" CLOB)

On which date did the Winfield Triple Challenge series take place?
SELECT "Date" FROM table_62370 WHERE "Series" = 'winfield triple challenge'
SELECT "Date" FROM "table_62370" WHERE "Series" = 'winfield triple challenge'