Mercer Island pickleball players celebrated Halloween with a costume contest and parade. Photo courtesy of Mercer Island Parks and Recreation

MI Martial Arts instructors Claudia Vleck and Jess Merly pose with student Varenna Ronald during a trick or treat event on Oct. 31. Katie Metzger/staff photo

Kite and Cal Robinson, ages 7 and 6, trick or treat in Islandia Center on Halloween. Katie Metzger/staff photo

Employees at Mercer Island’s John L. Scott office show off their Halloween decorations. Katie Metzger/staff photo

Some “ghoulishness” at Clarke and Clarke Art and Artifacts on Mercer Island. Photo courtesy of Ginny Clarke

Northwood student Iðunn Mattea dresses as a unicorn for Halloween. Photo courtesy of Anna Jónsdóttir

Ýmir and Ragnar pose in their costumes at Patti’s Play Center. Photo courtesy of Anna Jónsdóttir