CREATE TABLE table_6709 ("Date" CLOB, "Opponent#" CLOB, "Site" CLOB, "Result" CLOB, "Attendance" CLOB)

On what day(s) did the Gophers play against Michigan?
SELECT "Date" FROM table_6709 WHERE "Opponent#" = 'michigan'
SELECT "Date" FROM "table_6709" WHERE "Opponent#" = 'michigan'