Having been on a multitude of stag do’s and witnessed some of the idiotic things that go on, and also ridden the Nordschleife on my motorbike and witnessed some horrific crashes first hand, I would say that mixing the two is the daftest idea I’ve ever heard of :D
Maybe you aren’t the ‘weekend away/dress as smurfs in Warsaw/have a fight in a strip club etc’ type of characters though in which case you’ll probably be alright. Have a healthy dose of respect and a huge dose of common sense before you put your ticket in the gate and you’ll be okay. Its an incredible experience, second to none in my opinion.
Although I’d never go round it on a motorbike again! Having a Skyline GTR go past me sideways, about 2 foot from my left handlebar at 100mph was sobering. As was calling the ambulance to a fellow biker who had smashed head first into the Armco right in front of me and was missing most of his face.