The only parties I have ever understood or enjoyed are ones focused on a specific activity. E.g. a LAN party playing some game a group enjoys would be fun. Or playing cards or a board game or even a sports game if you're into that. Otherwise, what do you actually do?
So - what makes parties enjoyable for you? What do you think people that don't enjoy parties might be missing / should try doing differently at parties so that they also derive great joy from them?