Arlington PD Trunk-or-Treat is a free, family-friendly Halloween event put on by the Arlington Police Department and other local organizations. It takes place at Harold Patterson Sports Complex in Arlington, a fun spot for a spooky-season outing with the kids. Trunk-or-Treat is a classic Halloween tradition where decorated cars become candy stations, so you can go from trunk to trunk gathering treats. Dress up, bring a bag and enjoy an easy, feel-good evening with your neighbors.