I am lucky enough ( I add ) to be still a privileged World Record Holder of the attempt in Belgium with all the 407 Ducati Monsters. I wont ever forget that day taking part in a strange country with 12 of my UK friends going over with all the others coming from Europe. I am sorry your event got broken up because of all you guys effort but thankfully all our Monsters ( which they were ALL of type ) travelled a route close to our parade ground in a circle basically which was almost impossible to go wrong.
I can never experience the noise again I doubt but would in an instance do it once more if ever it got broken just for that thrill.
The record event in Belgium was organised by the MOB (monster owners of Belgium) as part of their annual September weekend get together.
I've personally attended their weekend event but sadly not the record one, the club take over the centre square of a small town and hundreds of bikes attend not all monsters but only monsters are allowed on the square other models of Ducati and other makes of bikes have to park around the town square, the pics that Albie posted are a wonderful reminder of their event.
Best of luck with your record attempt, let us know the result.