For your plan to Guam it so late and you still go to the Japan in July.
I think.
You go to in Guam late. You will be finished your work late too may be in July.
And may be you have to plan go to Japan in July.
It means that however you will not have free time for me in July and you will be wrong appointment.
Or you will say that can not control again.
Or do you intend to avoid this appointment.