Pongal, Makara Sankranti, Lohri
This list is merely indicative, not exhaustive
Probably more indicative of my ignorance than anything else
13/14 January [Last day of Tamil month Margazhi]
Bhogi Pongal (Tamil Nadu, Andhra Pradesh, Karnataka)
… a night to welcome the sun god…?
Bonfires lit to burn old and discarded household goods, to the beating of drums, Bhogi kottu (Tamil Nadu, Andhra Pradesh)
Uruka day: Assam
Lohri: Punjab, Haryana (til/sesame gajak)
14/15 January [First day of Thai, Makara Sankranti]
… day of the sun god …
Pongal (Tamil Nadu): [newly harvested rice, green gram, sugarcane made into sweet and savoury pongal]
Makara /Poush Sankranti: Karnataka, Andhra Pradesh, Maharashtra, Gujarat, W Bengal
[people exchange pieces of sugar-cane, molasses, pieces of dry coconut, peanuts and fried gram]
Magh or Bhogali Bihu: Assam
15/16 January
Mattu Pongal (Tamil Nadu), Kamumu (Andhra Pradesh): cows and bulls decorated; bullfights (TN – jallikattu, Assam – mohor juj)
16/17 January
A day for seeing the sights: Kaanum Pongal (Tamil Nadu)