Back in 2009, PBS filmed a documentary feature about the Pilgrimage to Chartres.  The article that is featured along with the video summarizes the 3 day journey and gives a brief history of the tradition of the pilgrimage:

“The pilgrimage began in the Middle Ages. Chartres was always an important place and had great meaning in the life of the Christian world in the kingdom of France in the Middle Ages. Joan of Arc made this pilgrimage. Louis XIV, I believe, made the pilgrimage. After Vatican II there were — there was a lot of confusion that developed in Catholic believers’ minds about what they ought to be doing, what they ought not to be doing, whether they were putting too much of an emphasis on particular practices that somehow or other had become outmoded, and as a consequence things like pilgrimages ended up suffering. It resumed precisely due to the concerns of groups that, by this point, were calling themselves traditionalists who wanted to commit themselves to maintaining practices which they felt to be, spiritually, extremely beneficial.”

The video can be viewed on the link below:

http://www.pbs.org/wnet/religionandethics/2009/06/19/june-19-2009-pilgrimage-to-chartres/3283/