user: Question: When did Richmond play an away game against Collingwood?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['St Kilda', '6.18 (54)', 'South Melbourne', '8.14 (62)', 'Junction Oval', 6000.0, '22 August 1931']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Away team" = 'Richmond';