I would not expect too much at the interview as your name would have been flagged. Depending on the conversation that went on at the port of entry, I would not expect anything from them from the next 10 years.
Since you already scheduled another interview, go there with confidence.

Can you please advise on graphic designers who know about the exact specifications for an advert on your site?

Hey there, it should not be an issue. When you get to JFK, if asked and only if asked, tell them you are heading to Baltimore via amtrak or greyhound. that way you show your confidence. if possible, book a Baltimore trip from JFK on the greyhound and show it to them. And if you are really going to NYC, you dont have to worry about what you said at the interview. Plans do change. if you have now changed your mind about going to B-more, then so be it. don't shwo any sign of nervous wreck. just go there and be honest. at the end of the day, they are human beings, but with a GUN

it is quite early to apply for 2018. only 2017 applications are being received for now