I was just thinking about this.
Denmark want to host the proloque and 2 stages of the 2018 edition of Tour de France and how does that involve the festival you ask?
Well the 1. stage will go from Roskilde to Odense and since the prologue is on the first Saturday in July then the first stage will be on the Sunday and many people will leave the festival after the last concerts.
I´m thinking a huge chaos of people arriving for the start of the stage and people leaving the festival, but 2018 is a long time away so lets see if they even get the tour start to Denmark. http://www.bt.dk/cykling/tour-de-france ... per-i-2018