Poppy's (Pre) Halloween Costume Contest Spectacular! was a fan contest held by Poppy during her "Moriah Poppy" era on October 28th, 2012.
A post on YouNow (a Tumblr blog) described the event as:
"Poppy and her friends will be getting spooky with some good ol' fashioned bobbing for apples, eating contests, and will be toying around with gruesome fake body parts. As always, you'll get to hear her lovable tunes and special Halloween-themed songs during her dance party! Part of Poppy's broadcast will be a Halloween Costume Contest, where she'll be inviting her viewers that are dressed in costume to Guest Broadcast alongside of her. At the end of Poppy's (Pre) Halloween Costume Contest Spectacular, she'll announce the winner of the contest, who will get an autographed photo, a YouNow Hoodie and a Halloween trick-or-treat candy basket! So get into your best Halloween costume and tune in to YouNow.com/featured for Poppy's (Pre) Halloween Costume Contest Spectacular on Sunday, Oct 28th at 8:30PM EST/7:30 PM CST!"