Thirteen-year-old Monikanchon dashed into the sea of clueless strollers, joyous visitors, and perplexed shoppers. The enthusiastic teenager head-butted and elbow-jabbed to reach some of his favourite stalls at the annual street fair on the occasion of Charak Puja on Beadon Street of Calcutta of 1920. It was the last day of the festival, and waves…