I spoke shortly with Robert Creech, the Artistic Advisor of "Summer Music in Galway". Now I know to take the citylink bus (ticket to be reimbursed) from the Dublin Airport, after I arrive on the 4th at 11:55 AM, straight to Galway. I get off at the Mayo Institute of Technology, which is right across the road from the Glasan Village Residence where I will be staying. And I wait there until people come for supper.
I won't promise that I'll stay put if I think I have enough time to roam a bit, depending on when I arrive.