The party complaints (people showing up and then being unable to get in the door, or showing up, leaving, and then complaining) are the main reason that I hardly ever let sims who don't have the Legendary Host reward throw them. It's one of the first rewards I give sims in games where parties are important/necessary. The constant party invitations for celebrities are annoying as well. I've yet to go to a good townie party. More than once I've shown up and the only one home was a cat or dog! But don't not show up to their terrible affair, or you'll get a false accusation the next day...