First, thanks for the pretty nice idea.
I didn't find the passage, if we will shoot with IDV-arrows or real arrows.

Have a look at Orophil's post on the first page of this thread, where he is explaining the rules.

He wrote the targets fall over, when hit properly. This is only necessary, when LARP-arrows will be used.

By the way, it will be too dangerous, to shoot with combat or hunting stuff. I don't think, that they will build up a fence around the tournament area, which is high and safe enough ...

we will be using larp arrows since sharp arrows can not be taken into IT/IC areas. Therefore it will be larp arrows only.

All larp arrows are permitted, but i highly reccomend idv since the have better aerodinamic properties making them more accurate.