Sentence:  For the occasion on which everyone already knows everyone else and the <WSD>host</WSD> wishes them to meet one or a few honored newcomers , then the `` open house '' system is advantageous because the honored guests are fixed connective points and the drifting guests make and break connections at the door . 
Meaning of the word marked with <WSD> tags:  a person who invites guests to a social event (such as a party in his or her own home) and who is responsible for them while they are there