As far as the Cake Boss appearing last year:
He did a seminar. They are 45 minutes in length, he prepares one item and the guests get a small taste of it with a small wine pairing. Cost $13.
He also did a Sweet Sunday. This is an event about two hours in length, including a buffet breakfast, in which he prepared three dessert items and servings of these were supplied to the guests. Been awhile since I did a Sweet Sunday but prosecco was served and you could get it refilled. Cost $90.
The above were both held in the Festival Center but are very different presentations. Also, the seminars and the ticketed events are listed separately, and have separate booking procedures. Last year you could book seminars online but you had to call for events (except the PFTS and the 3D dessert party which could be booked online)
If you want to bring children, be aware that they must have a ticket, and it will be full price, anyone under 21 will not be served alcohol but at times the only alternative beverage available will be water. The Sweet Sunday is probably one of the better ones for kids, but you may want them to be old enough and interested enough that they will sit for a two-hour presentation. I do not know if they can get a substitute beverage, there may have been some with the buffet.
You should also be aware that Valastro's sessions last year sold out - and quickly. You should definitely plan on booking as soon as possible if you want one. The schedules aren't out yet, so if you already have a trip booked you may not be able to tell if he'll be there while you are yet.