It's my understanding you can't carry concealed at music/concert venues. It's in the RCW's - jcw
Well, kind of ...
Here's the applicable RCW: RCW 9.41.300: Weapons prohibited in certain places
Here's the excerpt that applies:
"(2) Cities, towns, counties, and other municipalities may enact laws and ordinances:"
...
"(b) Restricting the possession of firearms in any stadium or convention center, operated by a city, town, county, or other municipality, except that such restrictions shall not apply to:
(i) Any pistol in the possession of a person licensed under RCW 9.41.070 ...."
So if you're properly licensed in Washington, you're legal. Not to say you won't catch a little flack from the management if your careless about your concealment, but you're legal. I'm in OR, but I go to WA often enough that I have the WA CPL as well as OR. There are, of course, differences between the two. So be careful.
..... And upon further reading I see that joeroket already covered outdoor music festivals. Sigh. Always late to the party and trying to catch up on the conversation. Wow, really late to the party. That was back in May, I see.