CREATE TABLE table_38781 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" TEXT, "Record" TEXT)

Who is the opponent of the game with 33,628 folks in attendance?
SELECT "Opponent" FROM table_38781 WHERE "Attendance" = '33,628'
SELECT "Opponent" FROM "table_38781" WHERE "Attendance" = '33,628'