The programme will be officially opened on Sunday, July 19th by Mr Kevin O'Malley, US Ambassador to Ireland.
The theme of this year's summer school is "2015 - Ireland at the crosswords."
Among the well known figures that will be in attendance will be Tánaiste and leader of the Labour Party, Joan Burton, Sinn Féin Deputy Leader, Mary Lou McDonald and Fianna Fail leader Micheál Martin. They'll all speak on the Monday evening of the programme.
The Enviroment Minister, Alan Kelly will address the Summer School on the Tuesday evening on the theme 'The Irish Water Saga - What now for ensuring supply to future generations'.
The MacGill Summer School is the leading summer school in Ireland and brings together figures from public life and various sectors of Irish society to discuss a range of issues.
It is open to the public and gives people a unique opportunity to hear and also speak with those involved.
There will be a discreet security presence in Glenties during the Summer school given the high-profile nature of the speakers, and as a number of protestors are likely on some of the days.
The summer school runs from July 19th - July 25th.