Portland Marriott Downtown Waterfront
You can't get much more convenient than this--right across the street from the festival venue! Standard rooms from $184/night, subject to availability. Room types are not guaranteed, indicated if you would like a king bed or two double beds in the notes when making your reservation.
Reservation link coming soon!
If these hotels are don't work for you (or are completely booked), there are a lot of other options in and around Portland, especially in the Downtown area and Convention Center/Lloyd Center area (a short MAX ride away).