CREATE TABLE table_32321 ("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 game when North Melbourne was the away team?
SELECT "Date" FROM table_32321 WHERE "Away team" = 'north melbourne'
SELECT "Date" FROM "table_32321" WHERE "Away team" = 'north melbourne'