Good and bad news for European F1 tracks: These events might rotate

With Stefano Domenicali commenting that Formula 1 is close to (re)introducing rotating Grands Prix, the question naturally arises as to which races are involved. Which races will be involved one year and not the next? If you simply look at the contract situations and the desires of the race organisers, you arrive at three Grands Prix that could end up in a rotation system.