Flight
SEA-TAC has a light rail that can take you downtown Seattle if you are looking to visit the city before coming out to Seabeck. The best way to get from the airport to the venue and the locations we suggested for lodging would be to get a rental car from the airport.
Rental Car
There is a rental car company attached to SEA-TAC. You can book it through the enterprise website, or you can find deals on KAYAK
Hotel
Hotel
We were unable to book hotel blocks, so we recommend any hotel in the Silverdale area if this one doesn't seem fit. Other options would be the Poulsbo area or Bremerton area. Airbnb or VRBO are also good options for housing.