| Dates | Events |
| 1901-09-17 | Birth of the First Chairman of the PNM Sir Learie Nicolas Constantine, T.C., K.C.M.G, Baron of Nelson and Colne |
| 1911-07-24 | Birth of PNM’s 1st Lady Vice Chairperson & 1st Female Minister of T&T, H.E. The Hon. Mrs. Isabel Ursula Cadogan-Teshea |
| 1911-09-25 | Birth of the Father of the Nation – The Hon. Dr. Eric Eustace Williams |
| 1956-01-15 | Inaugural Conference of the PNM in Woodford Square |
| 1956-01-24 | Public Launching of the PNM in Woodford Square, Port of Spain |
| 1956-07-14 | The Nation newspaper is established |
| 1956-07-30 | 1st presentation of the first-ever Legislative electoral candidates (24) in Woodford Square. |
| 1956-10-26 | 1st PNM Government sworn in at Government House, St. Ann’s |
| 1956-05-19 | Women’s League Committee launched |
| 1956-09-24 | 1st Victory at the General Elections Polls at with 13 successful candidates |
| 1958 | PNM Publishing Co. established at #90 Frederick Street, Port of Spain |
| 1959-07-26 | National Women’s League held its 1st Annual Conference at Brooklyn Hall, Port of Spain |
| 1959-07-13 | Introduction of Cabinet Government in Trinidad and Tobago with Dr. Eric Williams becoming the Territorities’ First Premier |
| 1961-05-14 | Death by car accident along Mc Bean stretch, Couva, of Minister John S. Donaldson |
| 1960-04-22 | (Federation) Independence Day March with presentations of Memorial to : H.E. The Governor, The U.S. Consul General, |
| 1961-12-04 | 2nd Victory at the General Elections Polls with 20 successful candidates |
| 1962-04-26 | Deed of conveyance executed in respect to no: 1, Tranquility St. (“Balisier House”), Port of Spain |
| 1962-05-19 | No:1, Tranquility St. (“Balisier House”) registered as No. 6045 of 1962 |
| 1962-08-31 | Independence of Trinidad and Tobago celebrated |
| 1963-03-22 | Meet-The-People-Tour started. Completed on 30th Jan., 1964 |
| 1964-06-14 | Meet-the-party-tour started. Suspended on 5th June, 1965. Resumed in Sept., 1967 |
| 1964 | Membership of H.M’s Most Hon. Privy Council conferred on the Rt. Hon. Dr. Eric Williams |
| 1966-11-07 | 3rd Victory at the General Elections Polls with 24 successful candidates |
| 1970-04-14 | Minister of External Affairs, ANR Robinson resigns |
| 1970-04-21 | State of Emergency declared on account of Riots pertaining to “Black Power Uprising” |
| 1971-07-01 | Death of PNM’s First Chairman, H.E. Sir Learie Constantine, T.C., K.C.M.G., Baron of Nelson and Colne |
| 1976-09-24 | Inauguration of the Republic of Trinidad and Tobago |
| 1976-08-31 | Ellis Clarke made Interin President of The Republic of Trinidad and Tobago |
| 1976-12-29 | Ellis Clarke elected by Electoral College as 1st President of the Republic of Trinidad and Tobago |
| 1977-01-29 | Ellis Clarke inaugurated as 1st President of the Republic of Trinidad and Tobago at President’s House |
| 1981-01-24 | Special Convention commemorating the PNM’s 25th Anniversary |
| 1981-03-29 | The death of the Father of the Nation, The Hon. Dr. Eric Eustace Williams |
| 1981-03-30 | The swearing-in of George Micheal Chambers as Prime Minister at President’s House |
| 1981-04-14 | Death of PNM’s First Lady Vice-Chairperson and First Female Minister and Ambassador of Trinidad and Tobago, Her Excellency The Honourable Mrs. Isabel Ursula Cadogan-Teshea |
| 1981-11-09 | 6th PNM Victory at the General Elections Polls with 26 successful candidates |
| 1983-11-15 | Death of Trinidad and Tobago’s first Governor General, H.E. Sir Solomon Hochoy |
| 1986-12-15 | 1st Defeat at the General Elections Poll with 3 successful candidates out of 36. The Appointing of Patrick Mervyn Augustus Manning as Leader of the President’s Loyal Opposition. |
| 1990-08-26 | Death of PNM’s second chairman, Hon. George Armsby Richards (D.O.B 26-10-1903) |
| 1991-12-16 | 7th PNM Victory at the General Elections Polls with 21 successful candidates |
| 1991-12-22 | The swearing in of Patrick Augustus Mervyn Manning as 4th Prime Minister at President’s House. |
| 1994-03-13 | Death of serving Cabinet Minister Morris Marshall |
| 1994-10-11 | Death of serving PNM Vice Chairman |
| 1995-11-06 | 1st tie at the General Elections Polls with 17 successful candidates, but with the other political party also having 17 seats forming a coalition wit the minority party having 2 |
| 1996-12-05 | Death of PNM’s Third Chairman. Francis “Boysie ” Casimir Prevatt (D.O.B 04-03-1912) |
| 1997-12-04 | Death of PNM’s Second Political leader, P.M. George Michael Chambers (D.O.B 04-10-1928) |
| 2000-12-09 | Disputed Elections with UNC’s 2 illegal candidates being allowed to contest and win majority to form Government, in addidtion to voter padding |
| 2001-11-11 | 11th Presentation of the General Election candidates (36) in Woodford Square |
| 2001-12-24 | The swearing in of Patrick A. M. Manning as 6th Prime Minister at President’s House |
| 2002-10-09 | The swearing in of Patrick A.M. Manning as 6th Prime Minister at President’s House |