The IWA at Nuremberg is mostly guns (but knives too). And this show is only for gunsmiths, dealers etc. (but there are ways to get a ticket
).
Every year in september/october is a rather big knife show in Paris with uS knife makers too (this year for example Allen Elishewitz and Chris Reeve among others.
There are also knife shows in Munich, Stuttgart, Vienna, Lugano,...
Check the gun magazines for time & location.
Good luck,
Frank