Check the following dates and locations, some with Howard Shore directing: (this from howardshore.com)
4/16/04 - Flemish Radio Orchestra and Choir
5/23/04 - London Philharmonic
5/26 - Phoenix Symphony - Alexander Mikelthwate, conductor
6/3-5 - Atlanta Symphony
6/17-19 - Sydney Symphony
7/13 - Philadelphia Orchestra
7/15-17 - Seattle Symphony
7/22-23 - National Arts Center Orchestra - John Mauceri, conductor
7/29-31 - Pittsburgh Symphony
9/18-19 - Hartford Symphony
9/21 - Hollywood Bowl Orchestra - John Mauceri, conductor
9/22 - London Philharmonic Orchestra - Royal Albert Hall