Welcome aboard. I wouldn't be so hung up on having open carriers specifically in those two towns, as much as being up on the laws and ordinances of where you are carrying.
Being over 18, one can legally open carry now, but be very careful as you don't have your permit yet.
I looked at the two sites ordinances and didn't recall seeing anything about regulating loaded/unloaded firearms, but once you have your permit, that will be less of an issue. Read through the site with others experiences and let us know if you have any specific questions.
Open carrying for the first time can be a scary ordeal. There is always lots of questions from others. Be prepared on how you will answer them. Be prepared to encounter the police. If you choose to carry a voice recorder, know the laws regarding them.
I'm sure if there is someone in the area that they will chime in.
Be sure to bring your bi-mart card for identification purposes when you go get your permit.
There was just a post about having a Vancouver open carry get together. In WA you don't need a permit to open carry, just one to have a loaded firearm in the car with you. Come join the fun.
It looks like Arizona currently honors Oregon permits. this will be in your favor. Be sure to check up on thier laws.
Also might want to think about getting a WA permit, or better yet, a Utah permit while your at it.