Not sure how to post screenshots, but I just started up a game as Italy, 3000 bc. The tamils were snooping around Europe so I met their masters, the Maharajate. Looking at the tradescreen, although India was at the top of the scoreboard, it was revealed that, in 1170 AD, they had not yet developed a calender. I had to see this for myself, so I opened up world builder and, indeed, saw an India with many calender resources completely untouched.