Contestants aged 13 and over can enter to win Their Chance to be one of 50 Grand Marshals For Live Stream Broadcast Highlighting Trick-or-Treat for UNICEF On Halloween Eve, Wonderama – the award-winning streamed family series, will live stream a first-of-its-kind virtual Halloween costume parade broadcast with 50 hometown “Grand Marshalsâ€Â, music, entertainment and more featured on