Please note that ALL foreign participants, including American and EU passport holders must hold a valid visa in order to travel to India. Visas must be applied for in advance at an Indian embassy or consulate. Foreign participants need to apply for a regular paper Visa (Business or Research Visa) from the nearest Indian embassy or consulate. e-Visa is not allowed.
The organizers will write to the foreign participants separately about the Visa process.
Online portal for Indian Visa application
Ministry of Home Affairs page on Visa details and Guidelines
The photograph specifications may be quite stringent. See here for an example of the specific