'Inkigayo' will not be airing on Christmas Day.
The show airs every Sunday at 12:15 PM KST. However, Christmas falls on a Sunday this year, and 'Inkigayo' will not be airing next week. Accordingly, all the groups performing on the 18th had their Christmas outfits and stages on the show.
Still, SBS will be airing their '2016 SAF Awards' aka 'Gayo Daejeon' on the 26th - the day right after. Not only so, but SBS' '2016 Entertainment Awards' will also air on the 25th, so fans will have a lot to watch even if 'Inkigayo' does not air.