Some key events & movements.
"History of 19th Century Ireland"
https://www.yourirish.com/history/19th-century/history-of-ireland-in-1800sThis has a brief outline. Click on individual topics in the History Timeline. There are 3 books cited as sources for each topic so if you want more information I recommend reading them.
There was unrest in Ireland in early 19th century Ireland due to a variety of causes.
Harvest failures 1816 & 1821. 1816 was "the year of no summer" due to a massive ash cloud over Europe, following a volcano eruption. Harvest failures and famine widespread throughout Europe.
Drought 1818
Fever epidemics 1816-19
Campaign for Catholic Emancipation 1820's
Tithe War 1830's
Repeal movement 1830 onward
People and movements:
Daniel O'Connell - Catholic Emancipation and Repeal
Rockites/"Captain Rock" 1820's
Ribbonmen
Some relevant Acts of Parliament:
The Treason (Ireland) Act 1821; This extended the English 1695 Treason Act to Ireland.
Catholic Emancipation Act 1829
Tumultuous Risings (Ireland) Act 1831 (latest in a series of Acts known as "Whiteboy Acts")
Irish and British newspapers reported on incidents, trials &c. Keep in mind that some newspapers were biased.
Wikipedia has a short list of notable events in Ireland for each year.