1. (in Bunyan's Pilgrim's Progress) a fair that goes on perpetually in the town of Vanity and symbolizes worldly ostentation and frivolity.
2. (often lowercase) any place or group, as the world or fashionable society, characterized by or displaying a preoccupation with idle pleasures or ostentation.
3. (italics) a novel (1847–48) by Thackeray.
Now YOU come up with a sentence (or fic? or graphic?) that best illustrates the word.