Call him and discuss options for meeting up - tell him your concerns. Give him the opportunity to re-arrange his schedule to fit into yours! If you are worried about something like having to stay the night in NYC tell him - he might be able to come up with a solution! Just give him some possible times that it might work for you, and leave the rest up to him.
So much easier to call him than try and work this out via email.
But let him know that this is casual and you wont be devastated if for some reason you cant meet up - you can be disappointed and let him know that you wish it was possible - I'm sure he will go out of his way to make sure he can see you!
