Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Home team | Home team score | Away team | Away team score | Venue | Crowd | Date |
| --- | --- | --- | --- | --- | --- | --- |
| North Melbourne | 8.14 (62) | Melbourne | 9.8 (62) | Arden Street Oval | 6522.0 | 31 July 1971 |
| Richmond | 16.12 (108) | Hawthorn | 11.10 (76) | MCG | 47951.0 | 31 July 1971 |
| South Melbourne | 13.8 (86) | Essendon | 13.18 (96) | Lake Oval | 7895.0 | 31 July 1971 |
| Geelong | 21.11 (137) | Collingwood | 19.14 (128) | Kardinia Park | 22000.0 | 31 July 1971 |
| Footscray | 11.10 (76) | Carlton | 15.16 (106) | Western Oval | 21670.0 | 31 July 1971 |
| St Kilda | 13.5 (83) | Fitzroy | 9.10 (64) | VFL Park | 14563.0 | 31 July 1971 |
Question:
When did the away team carlton play?
Answer:
31 July 1971