According to this article, the Prez is leaving on election night, Nov. 4th and arriving in India in time for the "Dwaili" celebration which is, ironically, is called the Festival of Lights.  It celebrates among other things, the return of the Hindu's "Lord Rama".  Hmmmm.....
 
http://timesofindia.indiatimes.com/india/Obama-to-arrive-in-India-on-Diwali-night/articleshow/6694694.cms#ixzz11b8lXWTk