Woohoo!! My missing thread came in to the LNS and I picked it up yesterday. I finished all the spots that used it (all in the rings).
Now all I need to do a little bit of backstitching on the shuttle and the bottom half of the pattern will be done!
You can see the comet at the top of the picture... it's the highest point on the pattern, too. Unfortunately, I had to scroll the fabric back down to finish the rings, so you can't see the whole thing.