SELECT "Venue" FROM table_78021 WHERE "Away team" = 'footscray'
What venue had footscray play at it?
CREATE TABLE table_78021 (
    "Home team" text,
    "Home team score" text,
    "Away team" text,
    "Away team score" text,
    "Venue" text,
    "Crowd" real,
    "Date" text
)