CREATE TABLE table_10509 ("Game" FLOAT, "Date" TEXT, "Score" TEXT, "Location" TEXT, "Time" TEXT, "Attendance" FLOAT)

What was the attendance on September 11?
SELECT MAX("Attendance") FROM table_10509 WHERE "Date" = 'september 11'
SELECT MAX("Attendance") FROM "table_10509" WHERE "Date" = 'september 11'