2026 Holly Jolly Celebration & Christmas Tree Lighting is a festive holiday party in downtown Allen, just north of Dallas. The evening features the lighting of the City of Allen Christmas tree, a drone show, light displays, an annual 5K and fun run, gourmet food trucks, rides and games, and Santa photos. It's free and family-friendly, so bring the kids, grab some hot cocoa and soak up the holiday cheer.