I'd really recommend that those advising carrying under a pretext stop doing so.
I tend to agree, and this is my reasoning:
It's up to the prosecution to prove that you violated a law. They find a loaded handgun in a vehicle without a CPL holder present, they have proven that you have violated RCW 9.41.050 (sort of... a person can always claim that a CPL holder actually placed the gun there, which is what the law states - and they then left it there...)
It is then up to the defendant to prove that he/she falls under an exception to the law specified in 9.41.060. The caution is, if you are going to carry under an exception listed in 9.41.060 a person needs to make sure they have enough credible evidence to prove that exception to a judge and/or jury.
Now, if you can convince the cop at the scene that you are carrying under an exception in 9.41.060 then he wouldn't cite you in the first place. However, you can show him a hunting license, a deer tag, a hunting area map, and a hunting rifle, if he chooses not to believe you, he will cite you anyway and you will be left proving your exception to a judge.
Question: Does an outdoor market or an outdoor festival count as an outdoor recreational activity? I go there for recreation and it's outdoors.