When you attend a social event as the distant acquaintance (through multiple degrees and links) of the host or guest of honor.
John is at the party because he is
best friend's with Gary,
who is dating Sasha,
who is Michelle's older sister,
who is working for Jerome,
who is throwing the party.
John: So I went to Gary's girlfriend Sasha's, sister's boss's party last night and it was awkward as hell.
Jack: Oh so you were just Kevin Baconning it.
John: Yeah, I guess.