Sure!
When I did it, runDisney posted a link on their website on the PHM page. I filled out the info, paid a deferral fee ($55, ouch) and they sent me a confirmation email. They then sent me another email a few weeks later saying they had charged me for the deferral fee.
On June 28 (2 weeks before regular registration) I got an email with a link that was just for me to use to register. The email said I could use the deferral link starting July 5 at noon and that the link expires on July 19 at 8PM. After I signed myself up for the 5K on Tuesday, I went ahead and used the deferral link. I was charged the difference between last year's GSC price and this year's GSC price to register ($15.99). Then I got a normal confirmation saying I was signed up for GSC.
A couple of things about deferrals...
- There are a limited number of spots available - I also had to defer PDC to 2017 and I think deferrals for that race filled up in 30 minutes or something crazy!
- runDisney does not publicly post when deferrals are available...I happened to see that they were posted for Princess.
@Keels luckily tipped me off that they were up for Tink weekend
- They could go away at any time...I have a feeling that runDisney will some day not offer a deferral option - none of my local races do!
- You cannot defer 5Ks or kids races. I was signed up for the 2016 Princess 5K and I just lost that registration fee altogether because I ended up not making the trip
Hope this makes sense. Let me know if you have any other questions!