"You don't need to greet your guests when they arrive for a party.  They'll make their own way in, so you can busy yourself taking care of other things." - TEM

"During a party you should prepare drinks so when the party comes it will make them a little oozy and more likely to have a better time!" - Lisa

"Have more then one door to your house the sims wont go through the door if its full of sims." - Jerica

"When you serve food, and let the sims eat it, always go to toilet and then a bath afterwards" - Jamie