user: Question: When has an Opposing Team of Mid-Districts?
Columns: ['Opposing Team', 'Against', 'Date', 'Venue', 'Status']
Types: ['text', 'real', 'text', 'text', 'text']
Sample row: ['Devon & Cornwall', 6.0, '14 September 1935', 'Rectory Ground, Devonport', 'Tour match']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opposing Team" = 'Mid-Districts';