You can cite no bigger event in the history of the the Bangalee people: the Liberation War against Pakistan in 1971. This was the first time we fought for the recognition as a distinct nation. The endless bloodshed and struggle for centuries came to an end (at least from outsiders) with the maturation and rise of "Bangabandhu" Sheikh Mujibur Rahman, the founding father of the country and the architect of the nation.
The Liberation War and the independence was not an act of a single person or event. Rafiq, Saalam, Barqat, Jabbar, and many others gave their life during the Language Movement of 1952. Many were imprisoned and killed protesting Ayub Khan's military rules: 6-point of movement of 1966, Mass Uprising of 1969, etc.
Finally, Bangabandhu asked his people to raise arms against the Pakistani military who killed hundreds of people during the peaceful protests of the 1971.
If you tell the story of the war, you must mention the bravery and far-sightedness of Tajuddin Ahmed, Syed Nazrul Islam, Captain Monsoor Ali, Kamrujjamn, General Ataul Gani Osmani, and many others.
Three milion people were massacared by the Pakistni military and local collaborators. Hundreds of thousands of women were raped. Village after village, town after town, were burned to the ground. There were deadbodys lying in every plain, and floating in every river. There were hardly any family who did not lose something in this war.
At the very end, facing an imminent defeat, the coward Pakistani military and the local collaborators (mostly, Jamat-e-Islami cadars) systematically killed many of the leading intellectuals of the country.
These war criminals have never faced justice for crime against the humanity. We should raise conscience among the people of the world to try these criminals. If we forget, as Elie Weisel depicted, "we are gulty, we are accomplices."