In reply to Roberttaylor:
Clachaig normally has live stuff most weekends I think but generally a band so maybe hard to play along with.
Not sure if the Laroch in Ballachuillish does anything but maybe worth a punt. Failing that the only place I know that does consistent sessions in the area is the Grog in FW, a bit out the way but the folk that play are always welcoming and you might get a free beer out of it!