Quoting an email sent out by the NKR tonight.
Unfortunately the central training of Sunday October 21st (tomorrow) has to be cancelled. The hall is not available to us because of the Amsterdam Marathon. We were not informed about this until just now.
Please inform your dojo-mates (especially the beginners) as much as you can!!
We are very sorry to bring you this news but wish you a nice Sunday anyway.
On behalf of the NKR,