Been there done that (different situations though) and yes, very uncomfortable for both people involved. You can try adopting a friend/sibling/cousin for the night and stick to them like glue and possibly avoid a long conversation because you’re “talking” to someone, or, before the questioner gets the chance to ask you, lead the conversation (still civil and friendly,) and ask them how their summer was, what color their ceiling is, how their pets doing etc. It wont save you from every question, but maybe it can save you from some. In theory, you can also name the last school you attended (unless it wouldn’t work) but at best, use it as a last resort because it can backfire really badly (especially with people getting info from multiple sources).
And you phrased the title really well IMO. :-/ Good luck with the wedding and the school sitch.