Chhath Mahaparva also known as Chhath Puja or Chhath Vrat is observed on Shukla Chaturthi of Kartik month as per the Hindu calendar. Chhath Puja Almost Takes Four Days And People Observing Fast Have To Follow It Strictly Without Water. As Per Gregorian Calendar, Chhath Puja Will Be Celebrated From 31 October To 3 November 2019. Surya Shashthi Aka The Main Day Of Chhath Puja Will Be Celebrated On 3 November 2019. There are beliefs about the celebration that certain mistakes while observing the fast for Chhath Maiyya can bring in bad luck. Watch the video to find out the nine mistakes to avoid during Chhath Vrat & puja to stay away from bad luck.