[Sigurd]

I'm sorry to say this, but I think that you are responsible for 100% of it, however, your friends should offer to pay their share, since:
a) it is the right thing to do
b) you were somehow goaded into doing the planning.

Advice for next time:
Forward your confirmations/screenshot of confirmation screen to the other people. This allows you to dodge pretty much all responsibility

Me nitpicking, totally off topic:
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if you are in a car accident no one is ever 100% at fault. therefore i dont feel i should have to pay it all

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I'm sitting in my legally parked car reading a book. You ram me from behind.