At any gathering there is someone who ends up talking to everybody, and it is rarely the funniest or best-dressed person in the room. It is usually whoever looks like they would be pleased to be interrupted.
Approachability is a set of small signals, none of them charisma. Head up. Phone away. A face that is not already braced for something tiresome.
Happy people go where they expect to be met. They are not avoiding anyone — they read a room quickly and land where it is warm.
Be the warm part of one room today, and see who arrives.