The impact on the midwest region of the removal of the Heathrow slots from Shannon will be discussed at the Humbert Summer School in Co Mayo today.
The annual event will debate the issue on its opening day, with Co Clare-based sociologist Fr Harry Bohan and Knock Airport boss Liam Scollan among the keynote speakers.
The shock move by Aer Lingus a fortnight ago has angered business and tourism leaders along the western seaboard who have demanded an U-turn to restore connectivity to the region.
New Mayo TD Dara Calleary will also take part in the event at the Newman Institute in Ballina.
The 21st summer school commemorates French republican General Jean Joseph Humbert, who sailed to Co Mayo with 1,100 soldiers during the 1798 Rebellion.
The themes of this year's four-day event will focus on social change and multiculturalism in Ireland and the EU's 50th anniversary.
Nobel Peace Prize laureate John Hume will deliver the annual School Peace Address in St Patrick's Church of Ireland cathedral in Killala on Sunday.