CREATE TABLE table_31577 ("Date" CLOB, "Venue" CLOB, "Score" CLOB, "Result" CLOB, "Competition" CLOB)

Tell me the competition of 20 august 2008
SELECT "Competition" FROM table_31577 WHERE "Date" = '20 august 2008'
SELECT "Competition" FROM "table_31577" WHERE "Date" = '20 august 2008'