Try the tacoma yacht club for members it is like $50 to rent. Try to see if you can find a mmeber in your wedding. It is pretty nice. Also Point Defiance Zoo does weddings
Try Pacific Grill Catering. They have their own events center and they also do everything for the Courtyard Marriot down town Tacoma. They are really great with their customer service. Their ballroom is fairly new and very beautiful. You don't really need to decorate at all.
Re: Tacoma Venue
http://www.tacomamountaineers.org/rentals.cfm
Good luck!