Twizel is in the south island of New Zealand, located between two mountain ranges the grassy fields was used for the Battle of the Pelennor Fields in the Lord of The Rings trilogy.
From Oamaru Mail comes this update regarding the casting call times:
From Hobbit looking for local extras
A search to find extras for The Hobbit film will be held in Oamaru next weekend.
Organisers will be at the Oamaru Opera House’s Empire Room on Sunday, September 25 from 10am to 1pm for the casting call.
Filming is expected to take place in the Twizel region in late November and December.