On December 20, TVXQ will be holding their 'TVXQ LIVE TOUR 2017 ~ Begin Again ~ in Tokyo Dome'. The concert was originally set to air on February 25.
However, a representatives of TVXQ announced, "TVXQ's upcoming concert broadcast, scheduled for February 25, 2018, will show footage from the Osaka City Dome tour stop instead of the Tokyo Dome tour stop. The Osaka City Dome stop will take place in January of 2018."
Prior to this, the SM duo appeared on a Japanese variety show, dressed in all black attire still in deep mourning and shaken up by the devastating news. It seems likely that the duo's side decided to broadcast a future concert, in light of how the circumstances may affect the concert taking place on December 20.