Table:
text: 2007–08 Wellington Phoenix season
Home attendance
Home attendance
Date_ Round Attendance Opposition Stadium
26 August 2007 Round 1 14421 Melbourne Victory Westpac Stadium
9 September 2007 Round 3 11478 Newcastle Jets Westpac Stadium
22 September 2007 Round 5 12127 Adelaide United Westpac Stadium
30 September 2007 Round 6 10127 Perth Glory Westpac Stadium
21 October 2007 Round 9 10560 Central Coast Mariners Westpac Stadium
17 November 2007 Round 13 8062 Sydney FC Westpac Stadium
30 November 2007 Round 15 18345 Adelaide United Westpac Stadium
1 December 2007 Exhibition 31853 Los Angeles Galaxy Westpac Stadium
7 December 2007 Round 16 8032 Perth Glory Westpac Stadium

text: 2007–08 Wellington Phoenix season
Home attendance
Home attendance
Date_ Round Attendance Opposition Stadium
14 December 2007 Round 17 9384 Queensland Roar Westpac Stadium
4 January 2008 Round 19 14288 Sydney FC Westpac Stadium
Total 116,824 excl. exhibition match 116,824 excl. exhibition match 116,824 excl. exhibition match 116,824 excl. exhibition match
Average 11,682 excl. exhibition match 11,682 excl. exhibition match 11,682 excl. exhibition match 11,682 excl. exhibition match

Question: Who is the opponent at Westpac Stadium when 31,853 visitors are seen in Wellington Phoenix in the 2007-08 season?