Boo! Halloween will arrive on Oct. 31, and here are ways you can celebrate throughout Northern Arizona. From 5 to 8 p.m., Uptown Sedona will host Uptown Trick or Treat. Kids are welcome to don their costumes and grab a bag to collect free candy from a variety of Uptown merchants. Visit sedonaaz.gov for more information. Cottonwood also will host its very own Halloween Celebration. Head over to the Cottonwood Recreation Center’s parking lot from 4 to 7 p.m. to collect candy and check out a lot of decorated car trunks. Visit cottonwoodaz.gov for more information.