"Nordic Larp" and the Knutepunkt (https://en.wikipedia.org/wiki/Knutepunkt) conference is close to you. I worked with a guy who organized an earlier battlestar galactica larp: https://petterkarlsson.se/2013/03/19/the-monitor-celestra-ba... and they do things like - rent a medieval castle and larp courtly drama, etc.

I'm in the US and they don't do this kind of thing often, but if you're interested by Odyssesus then nordic larp scene will totally be your jam, and honestly I'm jealous.

If there's anyone in Seattle doing this kind of thing, say something!