There is a great event in Takayama on the New Years Day 2011.
The fireworks are set off over the park.
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Date: 2011. January, 1st
Time: 20:00pm
Place :Alps sky park (about 30min from J-Hoppers)
(Please see this blog)
http://takayama-hostel.blogspot.com/2010/11/beautiful-snow-mountain-view.html