Sabita Ghosh and Rina Das had taught Bengali at their homes before Pragati Bengali School started. A proposal to start a Bengali Sunday School was brought in to the Pragati executive committee on 11th April, 1987 by the then Vice President Krishna Sen. On 25th April that year, a questionnaire was distributed among the general membership to ask about their feelings about such a school. To materialize the members' wish, a working committee was formed on 31st July.

On 11th October, 1987 the Bengali School had its first class in Wyndham House of Bryn Mawr College. After a short stay there, the school moved to Chestnut Hill Watertower Recreation Center. The school meeets on two Saturdays every month in that location ever since.