Sinn Féin TDs and senators are gathering in Dún Laoghaire in south Dublin, ahead of the autumn Dáil and Seanad session, with a specific focus on what the party terms the Government's "appalling record on children".
The Oireachtas members are due to be addressed by Stephen Morrison, the father of nine-year-old Harvey who died in July and had been subject to delays in accessing urgent scoliosis surgery.
Also speaking will be the teenage disability rights campaigner, Cara Dermody, on the need to ensure that assessing the needs of all autistic children takes place within six months.
Rebecca Meehan will detail her struggle to secure a special school place in Dungarvan for her son, Jay, and how the system needs to change.
Sinn Féin says that nine months on from the general election, the Government has "one of the worst delivery records in history".
"They have been mired in controversy over the grubby deal which led to the Government being formed, the misinformation during the election campaign to remain in power and the walking away from commitments which they made," a statement said.
The meeting is also expected to discuss the spike in the cost of living, ahead of next month's budget, with Sinn Féin signalling it will strongly oppose any Government plans to increase prices.
The parliamentary party will also consider the upcoming Presidential Election, and will argue that the Áras needs to remain an independent office rather than under the control of Fianna Fáil and Fine Gael.
Irish unity will be central to the election campaign, the statement added.
Sinn Féin is not expected to announce until 20 September whether it will field its own candidate or back Independent left-wing candidate Catherine Connolly.
Other people addressing the two-day meeting include Jack O'Connor, the Kerry football manager, and Bernard Dunne, the former world champion boxer.
