NDK actually has a wide selection of NDK swag available for purchase only during the convention. We've had two different styles of hats for two years now. One is a black and red ball cap with an embroidered logo, and the other is a really comfy black knit cap with and embroidered logo. We'll have photos of all our convention merch on the all-new website posted before NDK begins.
We're also getting some exciting new items this year, and we'll make those announcements once all the new stuff is in our hands.
The only NDK merch item you can pre-order is the official T-shirt for the year. Unfortunately, I do not know how to amend an already submitted pre-registration. That is not my area of expertise- but I'm sure there's someone here who will answer that portion of your question shortly.
We highly recommend pre-ordering a T-shirt if you have the opportunity. It's the only way to guarantee your size. If, for whatever reason you cannot pre-order a shirt, swing by the Merch table (located under the stairs where the Hertz desk used to be) as SOON as you can. Like Friday. We usually sell through the remaining non-pre ordered shirts, and typically don't have all sizes available by the end of Saturday.
Almost forgot to mention- The T-shirt price is the same regardless if you pre-order or purchase it at the convention. The benefit to pre-ordering is that you get to reserve your size.
