The venue is across the water from Seattle. The easiest ferry to take is the Edmonds/Kingston ferry, although you can also take the Seattle/Bainbridge or Seattle/Bremerton ferry. There is also an option to drive around the sound.
Get a 10% discount if you book through the link below!
https://www.marriott.com/event-reservations/reservation-link.mi?id=1632340315336&key=CORP&app=resvlink