I've been at a few weddings recently in lovely hotels with 3-course wedding breakfasts where the bride, groom and a lot of the guests are blatantly confused by the cutlery.
At DBIL's wedding neither he, new DSIL or her parents had a clue what to use. Poor MIL had to whisper what to do to them - and will probably turn up as an interfering MIL in AIBU herself because of it 
Whilst I don't think anyone should have to know what cutlery to use AIBU to think the hotel could at least give the bride and groom a few tips beforehand? Maybe in the paperwork so it's not patronising in any way.
If I didn't know I would like to know so I didn't make a plum of myself at my own wedding.
Not much you can do about the guests I guess but it's mighty irritating to find someone has snaffled your bread roll or one of your wine glasses because they don't know which side is which and the ensuing kerfuffle as the spare one is tracked down.