Welcome to our forum.
I've been to Seattle (earlier this year). Love the atmosphere.
Be sure to look at our Dating & Friendships subforum
, you may be able to find someone in your area. Also, Seattle is famous for its poly population. If you Google "polyamory Seattle" or "poly Seattle" you'll probably find several local groups.
Meanwhile, reading some of the threads on Polyamory.com will help you prepare (in mind and spirit) for a poly life. Enjoy your time here!