Answer : 4. "वाराणसी"
Explanation :

1. ‘Maha Kumbh of Divyangjan’ was organized for the first time in Varanasi.

2. ‘Maha Kumbh of Divyangjan’ was organized for the first time in Varanasi on 17 September 2023.

3. The objective of the event was to create awareness and provide a platform for the empowerment of people with disabilities.

4. ‘Maha Kumbh of Divyangjan’ is a gathering of persons with disabilities (Divyangjan).

5. The program was organized by the National Disabled Finance and Development Corporation (NDFDC).