Your utensils can be your basic stainless steel, if you like. Some events will have children's activities, but those don't usually last all day. If you have kids, you'll need to supervise them or make arrangements with someone else on site to watch them, especially near the fighting field. When a fighter is in the middle of a battle, he won't be expecting a small child to run across the field. And it's important to remember that lots of SCA participants wear and carry real knives and swords, and sometimes they leave them lying around.
Unsupervised children can get into trouble very easily.
Anybody under 12 must be accompanied by an adult, and teenagers from 13 to 17 don't need an adult but they must bring a waiver signed by their parents. Contact me for more information if you plan to attend an event alone. Actually, not as much as you would think. The most important difference is that people will be wearing that funny clothing, and expecting you to wear it, too. This doesn't include while you're setting up and tearing down your tents, but it does include practically every other time.