Each peth has a name,
some are named after people, e.g., Narayan Peth, Sadashiv Peth, Nana Peth, Rasta Peth,
some are based on a temple located in the locality, e.g., Kasba Peth, Ganesh Peth, Bhawani Peth
and seven of them are named according to the day of the week---Raviwar (Sunday) Peth, Somwar (Monday) Peth, Mangalwar (Tuesday) Peth, Budhwar Peth (Wednesday), Guruwar (Thursday) Peth, Shukrawar (Friday) Peth, and Shaniwar (Saturday) Peth.
Any guesses why these peths were named after days of the week?
The practice of markets/businesses open on a single day of the week still exists in villages in Karnataka (maybe also true in general for rural India).