CREATE TABLE table_name_41 (week INT, date VARCHAR, attendance VARCHAR)

Who was the opponent on the date of November 29, 1970 and the attendance was less than 31,427?
SELECT AVG(week) FROM table_name_41 WHERE date = "november 29, 1970" AND attendance < 31 OFFSET 427
SELECT AVG("week") FROM "table_name_41" WHERE "attendance" < 31 AND "date" = "november 29, 1970" OFFSET 427