CREATE TABLE table_52171 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Date" TEXT)

At what venue did the Essendon team play as an away team?
SELECT "Venue" FROM table_52171 WHERE "Away team" = 'essendon'
SELECT "Venue" FROM "table_52171" WHERE "Away team" = 'essendon'