Well, after dinner with DS and Dh and talking this whole thing over, we have decided not to go
I am very disappointed, but it seems like having him around all of those kids, eating peanutty cookies is too much of a risk.. FYI, this event is not close to home, it's about 3.5 hours each way, so a long distance if we had to leave after lunch.
Thank you for all of your thoughts, they were carefully considered and very helpful.
For those of you mentioning the food choices at the event... I was a little surprised by the fried food, and the nut choices really surprised me in this day and age. But from a type 1 perspective, they can eat as they always have, it's just that their pancreas doesn't produce insulin anymore because type 1 is an auto immune disease. So, we have to deliver the insulin for him, but we dose according to how many carbs he eats... Just like your pancreas delivers insulin to you as you digest your food.
It's true that some foods will cause a spike in blood glucose, but for instance, apples will send his glucose sky high with a dramatic fall, while ice cream is a nice slow rise with a slow decent.. And that's what we want. It's about timing the digestion and dosing the insulin to make sure that carbs are available when the insulin is in the blood stream. It's a science that I have not mastered yet.
Oh well guys, thanks for help. Bummed about nut allergy today. Darn it.