Is the titular sentence grammatically correct? I typically use will and I am trying to learn (and teach) better forms.
It sounds odd but if both I and you have made plans to be in New York and London respectively, it seems this is the way to state the fact?
Perhaps it is not OK to say "You are in London next week"? because it is somebody else's plan not mine, and who am I to treat is as confirmed? (well, if I were a supervisor or a military commander confirming plans for my subordinates I might need to say so.)
I already went through these two questions and this question is a followup. Any insight would be appreciated.