Seems to be tons of wedding threads at the moment, so thought maybe we should have a go at extrapolating from them what should definitely not be done when planning a wedding if you don't want to piss guests off.
The obvious ones seem to be:
No poems demanding cash gifts;
No awkward far flung destinations and then sulks when guests can't afford the money or time to attend them;
No disappearing for hours to have photographs taken while the guests kick their heels back at the hotel.
Anything else?