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.

http://mag.irish-music.net/Sessions/Sessions.htm

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