One winter festival which marks the start of new season is called by so many names, and in every culture the food prepared is essentially Khichdi (Lentil & Rice preparation) both Sweet (traditionally with Jaggery) and Spicy varieties. The festival traditionally involved eating sweets made of Sesame-Jaggery in all cultures. No matter what you call by name the festival is celebrated all over with similarity.
Happy Makara Sankranti : (AP , Karnataka, Kerala, Goa, Maharashtra)
Happy Pongal: (TN & Pondicherry)
Happy Lohri: (Punjab & Haryana)
Sakraat & Makraat: (Bihar, UP, Uttarakhand)
Happy Uttarayan -- (Gujarat, Diu, Daman)
Happy Suggi -- (Karnataka)
Happy Magh Saaji --(HP)
Happy Ghughuti -- (Kumaon)
Happy Makara Chaula -(Odhisha)
Happy Kicheri -- (Poorvanchal East UP)
Happy Pousha Sankranti -- (Bengal & NE)
Happy Magh Bihu -- (Assam & NE)
Happy Shishur Sankraat -- (Kashmir )
Happy Makara Vilakku -- (Like)
Happy Maaghe Sankrant -- Nepal
Happy Tirmoori -- Sindh Pakistan
Happy Songkran -- Thailand
Happy Pi Ms Lao -- Laos
Happy Thingyan --Myanmar
Happy Mohan Songkran -- Cambodia
Unity in Diversity