CREATE TABLE table_2880 ("Rank" FLOAT, "Rider" CLOB, "Mon 24 Aug" CLOB, "Tues 25 Aug" CLOB, "Wed 26 Aug" CLOB, "Thurs 27 Aug" CLOB, "Fri 28 Aug" CLOB, "Sat 29 Aug" CLOB)

When roy richardson 476cc aermacchi is the rider what is the time for saturday august 9th?
SELECT "Sat 29 Aug" FROM table_2880 WHERE "Rider" = 'Roy Richardson 476cc Aermacchi'
SELECT "Sat 29 Aug" FROM "table_2880" WHERE "Rider" = 'Roy Richardson 476cc Aermacchi'