Are there seats? Or can you bring lawn chairs

Outdoor blankets are definitely the way to go and especially bc it's such a haul to get to actual venue!

Lawn chairs that arent 8" or less or something like that are not permitted on the lawn. If you do bring chairs taller than that be prepared for people to throw hotdogs at you. Take a blanket much better safer easier.

If you bring a lawn chair use a low lawn chair like for the beach. If not you can rent them at the Gorge.

There are no seats and you can bring in your own chairs. There's a very big grass hill though, so blankets might be a better option