Second ride in the Bringin' it Back - Slow(er) and Social group rides.
Weather is look Freakin'-Fantastic for this upcoming Saturday.
In such, I think a trip up to Mt. Hood to do Knebal Springs (and maybe 8 mile) would make for a great weekend group ride. Much of this is tentative, based on rider interest at this point... but I'm thinking getting to the Trail Head at 10:00-ish'. Plan will to be ride Knebal, and then assess whether an 8 mile addition is in the cards or not.
This ride is intermediate in nature, by way of slower pace, plenty of rest stops, and no one get's left. You should have solid handling skills on a bike, as well as some degree of lung capacity - there is a bit of climbing to be done.