It is both and also a small gift shop with some tribal artwork for sale
Yes,, there is a auditorium for speaking events which takes up 2/3 of the building and then exhibits and a small gift shop is the rest of the building
It is both a museum quality exhibit with historic and modern art displays, weaving loom, carved canoe among other items, and a community center equally. It is a beautiful building inside and out. There is Duwamish beading available. I bought a delicious box of Indian tea I had never seen before. Check them for events but it's a good quick cultural stop any time.
I'd call to check. When we visited we used the longhouse meeting place mostly, can't say for sure
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