user: Question: When was the Mallala race held?
Columns: ['Race Title', 'Circuit', 'City / State', 'Date', 'Winner', 'Team']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Eastern Creek', 'Eastern Creek Raceway', 'Sydney , New South Wales', '16 - 17 Apr', 'Tony Longhurst', 'Benson & Hedges Racing']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Race Title" = 'Mallala';