This was an article I received from my daily “DIS” written by April 18, 2016. I get asked these questions a lot and thought I would pass this along. This is an article discussing the science behind registering for Disney races. When RunDisney opens registration for their races, they usually sell out on that day. So you have to have decided if you are going to do the event prior to the registration date, or you will not get in or participate. So, click on the event calendar below to link to the article with all the details.