To be fair, 'ceremony' is bigging it up rather. Each College does their own thing, but in very few is there any grandeur other than wearing a gown. In most its purely administrative - you sit through a series of lectures which are basically all titled either Behave! or Work Hard! and during them, a clipboard is passed round which you sign, and lo you have matriculated. There is usually a meal afterwards, but it's pretty much the same as any other meal.
You won't be invited to their matriculation, but you'll still gain a skill that's a parent for any other uni cannot get = Becoming a 3-D jigsaw puzzle expert by loading/unloading your car 2 x 3 terms x 3/4 years. ,