I understood completely. My characters are there with the Poertian family they live with, who in turn are there for the festival. Piripi thinks everything is big and strange because all he has ever seen before are yurts and plains. I know you said Sarnath was not a big place, but with so many people coming together it only felt natural that there would be a market.

Again, Piripi thinks these things are big because he does not know better. He is perhaps a bit like Ygritte in GoT, mistaking a tower for a castle.