Night temperatures do not go below 20 degrees Celsius in July. No special precautions are needed. However, if you are very particular, you may want to take prescription anti-malarial drugs. They would have to be taken every week, from 1 week before your travel to India till 4 weeks after. You may find an odd mosquito.
Repellents are easily available and widely used in India.
Most medicines are freely available in India and at a much cheaper rate than in western countries. A doctor will be available on call during the duration of the Conference. Food and Water Foreigners sometimes have trouble with Indian food and water. It is always advisable to eat warm food in a clean environment. Indian food is very diverse, and different from what most foreigners are familiar with even after eating in Indian restaurants abroad.