user: Question: What day did Chris Maddocks compete in the 35000 m?
Columns: ['Event', 'Data', 'Athlete', 'Date', 'Place']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1500 m', '5:46.24', 'Roger Mills', '29 August 1975', 'London , United Kingdom']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Athlete" = 'Chris Maddocks' AND "Event" = '35000 m';