In what way is that a sign? A person goes to an Indian Festival, he or she is more than likely to see some aspects of Indian religion portrayed there. Especially the Bhagavad Gita, since that is such a popular and widely read scripture. Seems perfectly natural to me. Although if the person himself calls it a sign, then good for him.

However, I wouldn't consider it a sign at all, and I think it's only logical for someone to see something like that there.

I've had that kind of experience far too often, that I've stopped taking such mundane things for signs (when they're really not, at least in my experience).