[FM16] Competitions with a host - all matches at the same stadium

I'm aalmost done with my project, I just need a little more input. I'm trying to recreate the World Cup and the Continental Championships and for them I have random hosts. Where do I specify that the games are played at a random big stadium in the host nation? Currently, all matches are played in the same stadium. E.g. I have France 2016 and all matches are played in Stade Velodrome when I use "Stadium = Host". What do I have to choose instead?

I only set the match days not every single fixture so it would be okay if each match day had an own stadium and not every match.