user: Question: What is the larges week for the date  august 9, 1968 and less than 64020 in attendance?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'August 9, 1968', 'at Los Angeles Rams', 'L 23–21', 64020.0]
SQL:

assistant: SELECT MAX("Week") FROM "Table" WHERE "Date" = 'august 9, 1968' AND "Attendance" < 64020.0;