CREATE TABLE table_37771 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Attendance" FLOAT)

Who was the opponent during the game that had more than 31,891 people in attendance?
SELECT "Opponent" FROM table_37771 WHERE "Attendance" > '31,891'
SELECT "Opponent" FROM "table_37771" WHERE "Attendance" > '31,891'