Yeah, the canon page itself is just blurb along the lines of "this is what CPS is and does, and this is how you get membership", kinda boring.http://cpn.canon-europe.com/content/yourspace/local/netherlands.do
itself doesn't say anything about octember 18th.
But at the Northlight page, the invite (roughly) translates to:
We're inviting you to the exclusive VIP event for CPS Platinum members tuesday october 18 in Roosendaal.
Program starts at 4pm and goes to 730pm.
Sign up before october 13th by emailing firstname.lastname@example.org
After signing up we'll send you details including the route.
See you on the 18th.
Interesting thing I've already noted, is that the canon repair centre is down near Roosendaal (almost at the border with Belgium), my 7D ended up there 3 times earlier this year, so that's my bet for the 'secret location'.
I've also got a few dutch friends with enough good gear to qualify for membership, i'll see if they got an invite...