Seeking advice: business casual or blazer and tie?

Web sources on business dress code in India are ambivalent, not to say downright contradictory. I think I’m meeting customers on only one day; the rest is geek-to-geek, or geek-to-executive. Will business casual be OK, or do I need to take some extra dress shirts and ties? (Or shall I pull a JG and just wear Duke and Jini shirts?) I assume T-shirts and cargo pants will be OK for travel days….