This Saturday, October 27th, Discovery Green will host Scream on the Green, a mash-up of movie night, dance party, karaoke and trick-or-treating. Adults and kids are welcome and there will be a costume contest for children (by age group), adults (by gender) and dog (by size). First place winners will receive a $250 IKEA gift card, so you'll want to get to one of these costume shops stat.
Other items on the fun menu include face-painting, magicians, fortune telling and caricature artists. For more about this event, visit their website.