Night curfew in Delhi on Dec 31 and Jan 1 to curb public new year celebrations; Yemen: 22 killed, over 50 injured in a blast on Aden airport after members of new cabinet land; Smaller marching contingents, short route, fewer spectators likely in R-Day parade due to Covid-19; IRCTC to launch new website today, capable of booking 10,000 tickets in a minute; Cold wave intensifies in North India, mercury likely to drop below 3 degrees in Delhi