I would imagine that you could call the pop-up in Tulalip, and get the info on the other 4, or call the Cabazon outlet main number and ask (951-849-7430). I didn't call the pop-up directly, as the visiting manager messaged me from her personal cell phone with an item she knew I wanted.
Here's the info from my FedEx shipping label for the pop-up in Tulalip....maybe start with this info.
10600 Quil Ceda
Space #512
Tulalip, WA US 98271
646-660-5144
ETA: Googling "Gucci Seattle pop-up outlet" gave me a different number to try as well.
(360) 502-4099
I got some clarification.....I misunderstood, and there are 5 Gucci pop-ups across the country for the holiday season. I believe this is the only one in the Seattle area. Sorry for the confusion!