CREATE TABLE table_33664 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the date of the match played at MCG?
SELECT "Date" FROM table_33664 WHERE "Venue" = 'mcg'
SELECT "Date" FROM "table_33664" WHERE "Venue" = 'mcg'