Sun worship in India: Nomenclature and regional names. Kumbha is a sun festival. Chhath in Central India is another festival. Numbers - don't count.
"In 2007, 70 million pilgrims attended the 45-day long Ardha Kumbh Mela at Allahabad, estimates the local administration. In 2013, 120 million pilgrims attended the Kumbh Mela at Allahabad. Nasik has registered maximum visitors to 75 million.
Maha Kumbh at Allahabad is the largest in the world, the attendance and scale of preparation of which keeps rising with each successive celebration. For the 2019 Ardh Kumbh (just half Kumbha) at Allahabad, the preparations include a US$590 million or €540 million temporary city over 2,500 hectares with 122,000 temporary toilets and range of accommodation from simple dormitory tents to 5-star tents, 800 special trains by the Indian Railway, artificially intelligent video surveillance and analytics by IBM, disease surveillance, river transport management by Inland Waterways Authority of India, and an app to help the visitors."
Makara or Makar Sankranti is celebrated in many parts of the Indian subcontinent with some regional variations. It is known by different names and celebrated with different customs in different Indian states and South Asian countries:
Suggi Habba, Makara Sankramana, Makara Sankranti : Karnataka, Andhra Pradesh, Madhya Pradesh Telangana
Makara Sankranti or Makara Mela and Makara Chaula : Odisha
Makara Sankranti or Til Sankrant : Bihar
Makar Sankranti, Maghi Sankrant, Haldi Kumkum or Sankranti : Maharashtra, Goa, Nepal
Thai Pongal or Uzhavar Thirunal: Tamil Nadu, Sri Lanka, Singapore, Malaysia
Uttarayan: Gujarat
Maghi: Haryana, Himachal Pradesh and Punjab
Magh Bihu or Bhogali Bihu: Assam
Shishur Saenkraat: Kashmir Valley[23]
Sakraat or Khichdi: Uttar Pradesh and western Bihar
Poush Sangkranti: West Bengal, Bangladesh
Tila Sakrait: Mithila
Maghi, Punjab, Bihu Assam, Pongal Tamilnadu,