This is an entry in our Disneyland 101 Glossary: Disneyland Resort definitions in under 101 words, from Mouse Brief.
runDisney offers a series of virtual and in-person running events for people of varying ability levels. The events take place throughout the year, and many of them take place within Disney’s theme parks. At the time of this writing, runDisney events at Disneyland Resort include the Disneyland Half Marathon on a winter weekend and Disneyland Halloween Half Marathon in the early fall. Registration links as well as training programs and trip-planning resources are available on the runDisney website. Many guests plan theme park visits around these popular events, and hotel occupancy can be high during these times.