Deb, looks like Angie booked Suika at 7pm. I am not sure how dressed up I will be (I'm starting to pack for the trip today, and not sure what I'll take to "dress up" in so it might not be terribly dressy), so I would not sweat it. I would encourage folks to NOT feel pressured to dress up if it makes things too challenging, especially for those who are traveling! (Myself included :-D)
I have no idea what I'll bring to wear, but it will need to pack pretty easily since I'll be shlepping my stuff all over WA state in the week or so before and after my time in Seattle. Time to get creative.