Celebrate Halloween at Sensorio, California’s largest immersive art experience, located in Paso Robles, with festive activities for the whole family. October 30: Enjoy a bounce house, spooky crafts and trick-or-treating at the Airstreams. Children ages 12 and under who arrive in costume receive free admission. October 31: Join the fun with a staff costume contest and trick-or-treating at the Airstreams. Children ages 12 and under who arrive in costume receive free admission.