What team did the Brows play against on October 20, 1963 to a crowd larger than 55,096?
CREATE TABLE "regular_season_schedule" (
  "week" real,
  "date" text,
  "opponent" text,
  "result" text,
  "attendance" real
);
SELECT "opponent" FROM "regular_season_schedule" WHERE "attendance">'55,096' AND "date"='october 20, 1963';