So I ought to provide a little more description of the space so all y'all can rule it in or out of your realm of possibilities.
Probably the greatest thing about the space is that it offers a sense of being in the middle of nowhere, while still being only ten minutes (or less) from downtown Seattle. So if your gig is well-served by a sense of remoteness, nature, and privacy, this place might be great for you.
When I describe the space as having a "large open indoor space" I realize that for folks who host "real" trainings and such, you're probably thinking Sheraton ballroom as your reference for "large". It's not that at all, sorry. We're much homier than that, which makes sense, since this is our home ... so, think lodge-in-the-woods, maybe.
Small groups are best. We've had a class of photographers here shooting for Patricia Ridenour's Form and Figure class--there were about eight of them shooting indoors and out. For a more sedate gathering (lecture-like?) a group of ten to twenty could be accommodated, depending upon how much gadgetry was involved.
So, a creative foray such as you describe Sarah, that might be a great match. And other trainings that would benefit from being in a more "warm" and comfortable space, conducive to one-on-one interaction and connection.
As an aside, it used to be that official Biznik events had to be held in public spaces, and I don't know if our space would meet Biznik definitions of "public" .... but I also do not see that listed any longer among the rules for Biznik events ...
Please let me know if it sounds like this might suit you, and we can talk more.