CREATE TABLE table_75578 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Venue" CLOB, "Attendance" FLOAT)

What is the average attendance for the game on September 26, 1976?
SELECT AVG("Attendance") FROM table_75578 WHERE "Date" = 'september 26, 1976'
SELECT AVG("Attendance") FROM "table_75578" WHERE "Date" = 'september 26, 1976'