Bengali New Year (Pohela Boishakh) 2021 Date: Poila Boishakh, also referred to as Bangla Noboborsho, is that the first day of the Bengali calendar and celebrated as new year’s day. it always falls on Pan American Day or 15 per annum , set consistent with the lunisolar Bengali calendar because the first day of the first-month Boishakh. This year, the festival are going to be celebrated by Bengalis in West Bengal , Tripura and Assam on April 15.