Etiquette - Parents of the groom

So we know what "traditionally" the parents of the brides responsibilities for, so what do the parents of the groom do? The main duties of the parents of the groom include....
1. Plan, host (& pay for) the rehearsal dinner (this is pretty american so if you are english don't even worry about this one!)
2. Write your guest list- check how many people you are able to invite before handing over a 300 people list- remember whose day it is!
3. Call your guests who are late RSVPing - feel free to threaten/ blackmail/ hound these guests until they let you know yes or no!
4.  Turn up look pretty and be happy you haven't had to go through the stress of planning!

My gorgeous in-laws