OK LW gloves with cheap Kathmandu fingerless over the top then any sort of shelled mitten will take care of the hands
Feet may be OK in those leather hiking boots if they are loose enough to wear 2 pair of warm sox without cramping the feet but adding a layer to the bottoms can be very effective so if there is room for thick footbeds I can recommend the reflective ones if you also add a layer of fibreglass mesh under them
http://www.bogong.com.au/superfeet-hotpink-d.htmlI found they made a big difference but my winter boots did have plenty of room to add them and don't forget the bread bag trick
As Wayno says a scarf around the neck is the equal of a layer of clothing
At that festival I assume that while you will be moving around the exertion won't be hard; therefore not generating massive amounts of heat and sweat.
Legs 3 layers, winter long underwear, any LW insulating layer but windproof layer essential IMO but almost anything that blocks most of the wind will do,
Torso 4 layers but if one of those layers was a warm ski parka then the normal nominal 3 layers should do, if the middle layer was equal to Polartec 300
Take an extra scarf each so if need be you can cover the mouth and nose and breath through that, it makes big difference I have found
2 hats or even better a LW balaclava or Finnish cowl under the beanie
Please take pictures, I am sure the newsreels and magazines do not do the festival justice
As before If I can lend you anything just message me