CREATE TABLE table_70471 ("Date" CLOB, "Tournament" CLOB, "Winning score" CLOB, "Margin of victory" CLOB, "Runner ( s ) -up" CLOB)

On what date was the Nike Colorado Classic held?
SELECT "Date" FROM table_70471 WHERE "Tournament" = 'nike colorado classic'
SELECT "Date" FROM "table_70471" WHERE "Tournament" = 'nike colorado classic'