Yep, went there 2 years ago with Sharky....The Friday night in Assen has to be seen to be believed....It's a massive carnival with loads of stages with bands playing and general mayhem. One word of advice though, if you're on your bike going into Assen, don't drink as they have hordes of coppers with breathalisers at checkpoints in & out of the town, with mobile Police stations set up by the road. The strangest (but coolest) bit is that everyone gets their deckchairs/barbeques out on the Saturday afternoon to wave at the bikes leaving the circuit...and I mean everyone; kids through to geriatrics - and the more noise the better as far as they're concerned.....Have an excellent time. BUT don't do what we did, set off home at 4am attempting to get on the earlier ferry at Calais....warp speed through Holland, Belgium and France doesn't do your neck muscles any favours!