Can anyone attend ? My kids and I are very interested to learn
If you show up you are welcome.
My dad has many leg hold/conibear type traps from the day of legalized trapping in Washington. Although illegal in Washington would it be worth time and effort to bring all his old stuff the the rendezvous for out of state attendees. Dad was a big supporter of the Washington State Trappers Association back in the 70's and 80's. He taught a trappers class for yrs here in Longview.
I think you would have better luck selling them at the Summer Rendezvous. With that said I don't think they will bring much. Possibly the worst time in history to be selling used traps. Normally for used you get something like $1 per size for footholds, maybe $10 for the larger size conibears. I bet you would do well to get half that this year.
Someone is going to have to buy them from you with enough meat on the bones to resell out of State and make a profit.
If you have Newhouse or collectible or maybe some wolf traps you might do better.