The Grand Palais is a beautiful place and generally speaking a nice restaurant. Here is one of the room.
As for the waffles, the first ones had been cooked before the start of the event (the event starts at 16:00), so that we could start eating at once without having to wait but unfortunately this also means they were lukewarm, not warm.
Some Waffles Made in Advance
A cook started to make waffles a bit after the start of the event but, probably because of the pressure of having many people queuing, the waffles were generally under-cooked. Otherwise, I would say that the dough was good but not exceptional.
Traditional Toppings: 3 Sorts of Jam, Sugar, Brown Cheese and Sour Cream
The price was good: 65 NOK for an adult and 32.5 NOK for a child (half price). I was however disappointed with the service. We had to wait just for a waiter to show some attention (no drinks, no napkins for about 15 minutes). When we left, no "goodbye", no "thank you" and no "here is your receipt". From a place of this standing, I was expecting better.
To sum up: it is a cheap opportunity to eat a lot of waffles in a beautiful restaurant but you should not expect outstanding waffles or great service.