Table: t_1970_vfl_game
Columns: home_team
home_team_score
away_team
away_team_score
venue
crowd
date

Question: What is the crowd for away team of north melbourne?
SQL: SELECT "crowd" FROM t_1970_vfl_game WHERE "away_team" = 'north melbourne'

Question: What is the date when the away team is essendon?
SQL: SELECT "date" FROM t_1970_vfl_game WHERE "away_team" = 'essendon'