Welcome to TE! Yes, you'll find lots of cycling wisdom and support here. I'm guessing that the STP is in your future, since you posted about a dbl-century and you're in the Seattle area, right? Good for you and congrats on your new bike too. If you're already riding 40/50 miles on weekends, you've got a great base to build your mileage in order to enjoy your event ride.

While we had to cancel the Skagit Valley ride on Sat (snow on the tulips!), watch for other ride notices in the Northwest section as there are a lot of experienced riders in the area and here on TE too.
Tailwinds!
Mary