NCG, same event maybe, but still another good opportunity to show your commitment to attending USNA. My DS when to as many of these events as possible. One thing was clear to me, the attending UNSA Regional Director took attendance through "request for information" cards and strongly recommended everyone in attendance fill one out (you've gotta wonder why). They want to know how interested you really are. Interested enough to attend these events?
I recommend strongly that you go if you can. Take the opportunity to shake hands and personally introduce yourself, let them know you're interested in attending THEIR Academy, that you've been selected to attend NASS and how much you're looking forward to it (or how great is was to be there [event post NASS]). Take the opportunity to ask what else you should be doing or if there's any other information you need to get in. Also ask about their experience in the military. The goal is to get them to know you personally, not just another application in a pile (without being a nuisance) and why they should select you to attend.
I found that the USNA RD was extremely helpful when it came time to get teachers or counselors recommendations sent in (even if they can't get the information moving they will know that's it's not from lack of effort on your part). Hint: this part of the process can be very frustrating.
I just think you should reconsider going to the SA information forums as much as possible. My DS resisted too, but soon saw the benefits. The USNA Regional Director looked him up at NASS. They will know who you are.
And most of all, have fun at NASS and best of luck on your application!
They like to hear from you as much as you like to hear from them.