Don't know if this is any use. Sessions for Donegal County from the Irish Music Mag. Not guaranteed to be correct or current.
Annagary - Jack's Thurs
Annagary - The Shamrock Sat
Bally Shannon - Seán Og 072 51522 Wed
Buncranna - Central hotel 077 61094 Thurs
Dunkineely - Central bar Wed
Falcarragh - Shamrock Lodge 074 35859 Sat
Glenties - Glen Tavern 075 51170 Fri, Sat
Glenties - Highland Hotel 074 35859 Sun
Gorta Hork - Billie's Bar Tue
Gorta Hork -Teach Rhuans Thurs
Gweedore -Hudai Beag's Mon
Killybegs - Sail Inn 073 31130 Fri, Sat, Sun
Moyville - Shan Rawdons Pub 077 82225 Fri
Info came from this site.
If you are travelling around find the scenic route into the Blue Stack mountains. It's wonderful and wild - the back of beyond. I can't remember where it is but it's not far from Donegal Town I think. It's signposted