''Pohela Baishakh'', the Bengali New Year, falls annually on 14 April and is popularly celebrated across the city. Large crowds of people gather on the streets of Shahbag, Ramna Park and the campus of the University of Dhaka for celebrations. ''Pahela Falgun'', the first day of spring of the month Falgun in the Bengali calendar, is also celebrated in the city in a festive manner. This day is marked with colourful celebration and traditionally, women wear yellow saris to celebrate this day. This celebration is also known as ''Basanta Utsab'' (Spring Festival). Nabanna is a harvest celebration, usually celebrated with food and dance and music on the 1st day of the month of Agrahayan of the Bengali year.  Birthdays of Rabindranath Tagore and Kazi Nazrul Islam are observed respectively as Rabindra Jayanti and Nazrul Jayanti. The Ekushey Book Fair, which is arranged each year by Bangla Academy, takes place for the whole month of February. This event is dedicated to the martyrs who died on 21 February 1952 in a demonstration calling for the establishment of Bengali as one of the state languages of former East Pakistan. Shakrain Festival is an annual celebration observed with the flying of kites. It is usually observed in the old part of the city at the end of Poush, the ninth month of the Bengali calendar (14 or 15 January in the Gregorian calendar).