CREATE TABLE table_39816 ("Date" TEXT, "Opponent" TEXT, "Location" TEXT, "Result" TEXT, "Attendance" FLOAT)

On 10/20/1979*, who was the Opponent?
SELECT "Opponent" FROM table_39816 WHERE "Date" = '10/20/1979*'
SELECT "Opponent" FROM "table_39816" WHERE "Date" = '10/20/1979*'