Dougie Maclean's Taybank Hotel in Dunkeld is worth a visit. If he's around, he's happy to sit in on the sessions.. nice guy.If you get to Glasgow - there's always stuff going on - there's literally at least one session going on every night of the week.
My current personal faves are : Wednesday night at Cafe Source, St Andrew's In The Square, Thursday at the Uisge Beatha in Woodlands Road, and Sunday at the Uisge Beatha, but there's also stuff at the Ben Nevis, the Park Bar, The Scotia, The Clutha Vaults, Babbity Bowster, and the Lismore
And then there's the folk clubs - The Star, etc...
Cheers
Steven