Table: t_1971_vfl_match_4
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: Where did carlton play while away?
SQL: SELECT "venue" FROM t_1971_vfl_match_4 WHERE "away_team" = 'carlton'

Question: What was the top crowd when essendon played away?
SQL: SELECT MAX("crowd") FROM t_1971_vfl_match_4 WHERE "away_team" = 'essendon'