CREATE TABLE table_66683 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What opponent has December 6, 1964 as the date?
SELECT "Opponent" FROM table_66683 WHERE "Date" = 'december 6, 1964'
SELECT "Opponent" FROM "table_66683" WHERE "Date" = 'december 6, 1964'