Randhan Chhath or Randhan Chhat is observed on the previous day of Sheetala Satam Vrat in Gujarati Shravan month. It is not a vrat to observe but the preparation day for Sheetala Satam Vrat Puja. Randhan Chhath 2012 date is August 7. It falls on Vad Sashti or the sixth day in Vad Paksh or bahula paksh in Shravan month.
On this day food for Sheetala Satam festival is prepared. Cooking food on Sheetala Satam is avoided because cold meals are taken on this day. Devotees believe that Goddess Sheetala Devi visits kitchen and curses if food is cooked on Satam day.