CREATE TABLE table_78510 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

In what venue was the hosted away team Essendon?
SELECT "Venue" FROM table_78510 WHERE "Away team" = 'essendon'
SELECT "Venue" FROM "table_78510" WHERE "Away team" = 'essendon'