The Drupal Association announced to the world that they would want to host the next Drupal Conference in India for 2016.

With that they listed points for picking locations for the planned event (captured from this page)

Popularity

People want to visit the host location to site see.

Strong local community

Size of the camp in the proposed city / # of camps in a country

Size of Drupal business community

# of Drupal businesses within that country and region

Ease of doing business with a country

Easy to set up a financial entity so we can collect ticket sales revenue and pay vendors in local currency.

Local Support

The community reached out to the Association, requesting a DrupalCon and offering to help produce it.

Inexpensive travel

This gives insight into the average cost of lodging in the city

Visa

Easy to get a visa or one is not required to enter a country.

Strong business environment

The number of Fortune 500 companies in that region

Community survey

Where does the community want to go?