I did this for my parents’ 50th anniversary about 10 years ago. There are certain restrictions as to whether you can do a large table at a restaurant based on number of guests -12 is the number that used to oblige you to shift to Disney event planning, and it must be internal unless something has changed. Some of the Disney Springs restaurants have more lax rules. Your best first step is to contact internal events, and I’d also recommend searching the boards for previous threads regarding Springs restaurants.
Also… you probably COULD do something in a villa or hospitality suite as long as you did it during the day. I was staying at BLT in 2020, and there was a legit party across from my room. Like a bunch of 20-somethings, screaming and playing loud music. When I called to complain, they said quiet hours started at 10 or something. I had to go to the front desk and show a video to get security activated. A civilized party during the day, with guest #’s within reason, perhaps wouldn’t create much interest from the CMs.