Sentence:  For the occasion on which everyone already knows everyone else and the host wishes them to meet one or a few honored newcomers , then the `` open house '' system is advantageous because the honored guests are <WSD>fixed</WSD> connective points and the drifting guests make and break connections at the door . 
Meaning of the word marked with <WSD> tags:  incapable of being changed or moved or undone; e.g. "frozen prices"