| Date | | | |
| 15-Jan-1920 | | First Municipal Elections in the City under the Local Government (Ireland) Act 1919, (Proportional Representation). By this Act the City was divided into ten Electoral Areas. | |
| 23-Feb-1920 | | Owing to the disturbed state of the City persons within the Dublin Metropolitan Police District required to remain within doors. Between the hours 12 o'clock midnight-and 5 o'clock a.m. ; on the 30th June the hours were altered to 12 o'clock midnight and 3 o'clock a.m., and on the 23rd November to 10 o'clock p.m. and 5 o'clock a.m. | |
| 29-Mar-1920 | | Gen. Sir Nevil Macready appointed Commander-in-Chief of the Forces. | |
| 1-Apr-1920 | | Sir Hamar Greenwood, bt., appointed Chief Secretary for Ireland. | |
| Dec-1920 | | During the year numerous deaths of civilians and members of the Crown forces were caused by shootings in the city and suburbs. | |
| 22-Dec-1920 | | The Military Authorities took possession of the City Hall and other Municipal Offices. | |
| 23-Dec-1920 | | The Government of Ireland Bill received the Royal Assent. | |
| 1-Apr-1921 | | Curfew hours altered to altered from 8 p.m. till 5 a.m. | |
| 1-Apr-1921 | | Lord Edmund Talbot (Viscount FitzAlan) appointed Lord Lieutenant of Ireland on resignation of Viscount French. | |
| 19-Apr-1921 | | Government of Ireland Act came into operation. | |