Halloween
From Jenny Everywhere Wiki
Halloween was a holiday celebrated by nightly partying and costuming, which had something to do with spookiness.
Every year, Strach, the Abstract of Terror, organised a Hallowseen party attended exclusively by ghosts, demons and other spirits at D'Ismay Mansion. Jenny Everywhere once invited herself to the party to give Strach a message on behalf of his cousin Lit; for the occasion, she used her shifting to give hersdelf a ghost costume, also noting that she could “do a mean werewolf”. (COMIC: Jenny Everywhere in the House of Terror)