user: Question: When was a competition held at Pietermaritzburg?
Columns: ['Bowling figures Wickets-Runs (Overs)', 'Bowler', 'Versus', 'Venue', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['7-15 (7)', 'GD McGrath', 'Namibia', 'Potchefstroom', '27-02-2003']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Venue" = 'Pietermaritzburg';