user: Question: What is Date, when City / State is "Mallala , South Australia", and when Team is "R.J.Macarthur Onslow"?
Columns: ['Circuit', 'City / State', 'Date', 'Winner', 'Team']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Mallala Motor Sport Park', 'Mallala , South Australia', '7 May', 'Mark McLaughlin', 'Elfin Sports Cars']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "City / State" = 'Mallala , South Australia' AND "Team" = 'R.J.Macarthur Onslow';