A sure sign that the holiday season is near is the presence of volunteer electricians from IBEW Local 48 getting The Grotto in Northeast Portland ready for its annual Festival of Lights. As they have done for the past 23 years, electricians mounted panels and assembled temporary power boxes that supply power to more than half a million lights and fiber-optic and animated displays in a walk-through depiction of the story of the birth of Christ. Sixty-five union members, their families, and friends volunteered this year. Union contractors of the National Electrical Contractors Association donated equipment. The Festival of Lights is open nightly through Dec. 30 from 5 to 9:30 p.m. General admission is $8. Kids under 12 get in for $4. Canned food donations also are being collected. The Grotto is located at NE 85th and Sandy Boulevard, Portland.