I almost did the dumb rookie move. I got so excited about getting Dopey (and getting in so quick - my first wait time was 6 minutes) that I hit pay now instead of register another person. Having learned my lesson from Wine & Dine, I finished my registration and then went to the next available queue window that I had (thankfully, only about 2 minutes behind the first) and did a separate registration for my friend's 10K.
All is well!