CREATE TABLE table_27699 ("Round" FLOAT, "Circuit" TEXT, "Location" TEXT, "Date" TEXT, "Pole position" TEXT, "Fastest lap" TEXT, "Winning driver" TEXT, "Winning team" TEXT, "Supporting" TEXT)

What circuit was used on August 21?
SELECT "Circuit" FROM table_27699 WHERE "Date" = 'August 21'
SELECT "Circuit" FROM "table_27699" WHERE "Date" = 'August 21'