Hi Michele...welcome. I am not aware of a ceremony; just the first day they qualify to wear them. Our DIL took a picture; and I believe the aviators went out for a beer that evening. But that was 10 years ago...and things do change! Also, if you haven't found it; we have a Naval Aviators group on this site which has lots of info specifically relating to aviators. We would be happy to have you join! Congrats to you and your aviator!
I'm so glad you asked that question, because I was wondering the same thing!
I'd be surprised if you find a parent who attended flight suit Friday. I've had the pleasure of attending several (8) military graduations/ceremonies for my LO. If you ever get the opportunity to see your LO fly, that is the best experience you can have IMHO. I watched my son fly for an hour or so, up close and personal. It was great. After that, if you ever get the opportunity to go on a Family Day Cruise, do it!
LO = Navy for MOMS acronym = Loved One. Naval Aviators prefer to wear their "bags" whenever possible. I just remembered another ceremony/graduation (the 9th) I attended where protocol allowed flight suits. The patching in ceremony to his first squadron (from the RAG). There was only one other event I attended where flight suits were worn.
So one of my son's college buddies had his flight suit Friday about a week ago, and that evening they all went to celebrate at the Officer's Club. But it was very much just a thing for the Ensigns and their SO's - not a parent kind of thing at all, lol.