Yup tag along is fine 'round here on the Sky, the Middle Middle, the Green Gorge, ect. those are the main staple runs out of Seattle and will be running again by the end of October, throughout the winter. Generally those runs provide great opportunities to meet people because lots of people run them, they are relatively easy and accessible, and people commonly posts trips here on the site.
If you don't have a creeker, you might as well start dropping some coins in your piggy bank, 'cause this region is CHOCK FULL of awesome paddling, much of which is more comfortably run in a creekboat.