Table: shell_champ_series
Columns: event_circuit
city_state
date
format
winner
team

Question: what is the date of barbagallo raceway?
SQL: SELECT "date" FROM shell_champ_series WHERE "event_circuit" = 'barbagallo raceway'

Question: What city is the hidden valley raceway in?
SQL: SELECT "city_state" FROM shell_champ_series WHERE "event_circuit" = 'hidden valley raceway'