A couple ideas to improve parties a bit...

I really miss the option to choose when and what to wear. Also the parties are too short - you should be able to choose time and duration for each party. The time before meals are cooked, people got inside and mixologist making drinks the party is already over before my sim can get to 'party'. Also I would like to throw a houseparty, like a dance party but at home, and a pool party. I barely use the pool, so why not a pool party?