CREATE TABLE table_203_478 (id NUMBER, "week" NUMBER, "date" CLOB, "opponent" CLOB, "result" CLOB, "attendance" NUMBER)

which game date only had a bit more than 20,000 in attendance ?
SELECT "date" FROM table_203_478 WHERE "attendance" > 20000 ORDER BY "attendance" LIMIT 1
SELECT "date" FROM "table_203_478" WHERE "attendance" > 20000 ORDER BY "attendance" FETCH FIRST 1 ROWS ONLY