Day of World Silence and Silence. December 16 is one of the most “silent” days in nature. In the old days it was believed that on this day you should try to talk less. It was believed that he who is silent will be eloquent all year. In many countries of such days there is no time left for eloquence. Publicity is in short supply.
... where no progress has been made. Trump was absent because he was obviously busy with other activities.