MICROPHONES for speeches!! Why has no one said this? Surely it must be the most irritating thing ever devised, especially when passed from person to person so they can all pay tribute to the happy couple.
Repeatedly imply that you are "marrying down" - that will annoy and embarrass at least half the guests, if not all.
invite as many ex couples as you can get away with, along with new partners. Seat them together. Then do the same for any long standing feuds.
Make it clear beforehand that this is your BIG day and no one is to do anything that might impinge upon it.
Children to be invited but must remain quiet and well behaved (state this on the invitation).
Spread a rumour that you intend to give the children diluted wine to toast the happy couple and that it is your wedding, so you will not be consulting with the parents first, nor allowing exceptions.
Have a dress code.
Ask for cash contributions towards the honeymoon instead of presents.
Talk incessantly about the wedding for months beforehand. Be creative about the level of detail you can go to and the length of time you can talk about each detail.
Give relationship advice to those already married and how to get a husband to those who aren't.