Halloween

"This happens at Halloween. Your imagination runs wild. Remember last year you didn't want to trick-or-treat 'cause you were afraid of the monsters?"

- Daryl on Halloween

Halloween is a known celebration observed on Earth One on 31 October with themes being supernatural.

History
Established at some point, celebration of Halloween includes such traditions as trick-or-treating, costume play, house decorations, pumpkin carving and parties. The holiday in a modern sense was a common knowledge as early as late 1920's and early 1930's, with Al Capone referencing it in regards of costume play in 1931.

In 2005 Tommy Merlyn hosted a Halloween party in Starling City with Laurel Lance and Oliver Queen in attendance, former wearing fishnets as a part of her costume.

In 2014 John Constantine was in Alabama on and around Halloween exorcising the spirit of Marcello Panetti from Henry, who had destoyed the pumpkins his mother was about to carve for the celebration and was dressed in a dead man costume for the celebration. Successful exorcism trip culminated in John observing the children trick-o-treating while lying on his car, drinking beer and smoking.

In 2015 Cisco Ramon participated in decorating a Stein House, well known for it's Halloween decorations for the holiday with Clarissa Stein.

Behind the scenes

 * In the real world Halloween is a holiday mainly originating from Celtic harvest festivals and particularly the Gaelic festival Samhain, celebrated on 31 October and in the number of coutries and widely regarded as a pop-culture staple all over the world.
 * In the DC comics, Halloween is seen frequently, with comics printed in October often having variant or regular covers themes after it such as in 52 #25.