Someone on Ravelry just mentioned this book that I had never heard of.
It's called How to Be a Perfect Stranger and it is a guide book to most of the religious services one might encounter in the U.S.
Absolutely brilliant idea for this very diverse country. It looks like they cover a lot and answer questions about how to dress, how services work, how to address the clergy, etc.
I ordered it from Amazon, and I look forward to seeing what it has to say about Hinduism.