What is Joy mongolbar for Bengalis?

This elebrated by the bengolies.The ladies use to keep fast ,do puja if maa nangolchandi,the other name if maa durga.if in a monh there is four or five Tuesdays then it can be done in all the four or five Tuesdays or the 1 st and last tuesday of the month.it us especially done in this day only because mangol chandi puja is done in the Tuesday only.This puja us done for there family's peace and prosperity .