Semi-formal: suits and dresses, but we also understand it's an outdoor wedding in July! We encourage you to prioritize comfort - no tie? No problem! Comfy shoes? You bet!
We would bank on allotting 35-40+ minutes to get to the wedding from the Portland area. We would STRONGLY advise either renting a car, or grabbing a ride from a friend who can drive you - getting an Uber to the event is doable, but getting one back to Portland from the Columbia River Gorge at 11 PM is going to be a CHALLENGE. Have a designated driver, link up with your pals, and get home safe!
Think: sunscreen, maybe a sunhat, comfortable shoes that you don't mind walking around in some grass in. The sun won't set until close to 9 PM, so be prepared for that as well.