The largest crafts fair in the Netherlands is called what it is: Handwerkbeurs. It is twice yearly and it's huge. The next fair will be in Zwolle on the 25th, 26th and 27th of February and I’m looking forward to it. There will be around 140 stands with all sorts of crafting ideas and supplies, exhibitions, presentations, competitions, a Dutch Knitting Café and a lot more.
And of course visitors cannot only see and buy stuff but also do things. There are workshops on various knitting techniques, weaving, spinning, felting and dyeing. Or you can make soap chains, wishing hearts and other gadgets. You can even learn temari :) It's a great mix of traditions and novelties from many different places. Like a friend of mine would say: dulge in!