Yes. The rate is $20/night for adults. Please visit the link below and scroll to the bottom of the page for instructions. http://www.skalitude.com/outdoor-camping-weddings/
First, text Amanda or Kenzo to see if they might have gear for you to borrow! There is a limited supply, so if this falls through, REI is here to save you! Visit REI's rental website and secure yourself a tent, sleeping bag, and sleeping pad... Oh and don't forget to grab a headlamp for the evening! You should be able to rent a sleeping bag, pad, and tent for ~ $80.00 or less. https://www.rei.com/stores/rentals It will be easiest to rent gear from either the Seattle Flagship or Issaquah store.
Rent a sprinter van! This is a great option to make sure you're comfortable and shielded from the elements, but ensures you can crash just steps away from where the reception is. You can also skip the rental car and your accommodations and car all come in one. What a deal! https://www.outdoorsy.com/ https://booking.cabana.life/