1 st. of this the kolkata is not now poschimbango. for your information the west bengal is call now poschimbango. but it is now not confirm the central govt. not give the seal about this matter.
2nd. in dashera/dewali time not only kolkata most of india have heave rush this time . you send your PNR no in PNR blog. the expert will comments abut that matter.
thanks.