How do I choose a weekly trait in order to host a party?

Hi @CorkyBebe

are you ok now with game? If you have retired a sim and got an heirloom, and promoted or created a new sim you should have your trait and be able to host party ok. 

You might need to look at the quests and follow those through as they will guide you thru some of the relationships and wedding quest and baby quest. Be aware they are timed quests , I think you get a couple of days to complete them but they will help you understand basics of how they work in game, that and reading forums!