CREATE TABLE table_61688 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" FLOAT)

What was the attendance on September 19, 1971, after week 1?
SELECT AVG("Attendance") FROM table_61688 WHERE "Date" = 'september 19, 1971' AND "Week" > '1'
SELECT AVG("Attendance") FROM "table_61688" WHERE "Date" = 'september 19, 1971' AND "Week" > '1'