College fests would start by that time
Pet fest is the most awaited one, however boho Bazar is also happening on 20-22nd Dec.
You can obviously consider DU fests
A lot of fests in delhi university colleges will take place in January.
Usually a lot of them are announced closer to the time but i suggest attending Jaipur Literature Festival which is taking place from the 23rd-27th of Jan, 2020 at Diggi Palace in Jaipur!