I may do Dopey in 2018. Truth to had, I'm more incline to the harder challenge of Goofy (in my situation), but if my son does the 5K then I'll sign up for Dopey plus I have yet to do the 10K. However should Dopey sell out, I will simply sign up for the 5K, 10K, and Goofy. I'd still complete Dopey, just unofficially.