No probs Jim: while I was looking up the dates for Maggie and Liz, I came across a lovely Flickr album of photos from the CD launch which took place in Maggie's care home. And yes, Maggie was a generous host to many musicians who came to play in Edinburgh, while she was still fit and in her own home.
Often heard her sing "Sandy Bell's Man" in our local sessions, and other Edinburgh singers still like to do it as well, and probably most other local songbirds will know the chorus at least.
Re "The World's Room" - it's a lovely concept and works very well, but probably far more ordered than BD would remember of Sandy Bell's back then. The guest does a few songs, then those others attending get an opportunity to do a song each: no random jumping in! Mostly unaccompanied singing.
The big session at the Waverley now is George Duff's Sunday afternoon, which started a few years back, and is almost a Hall of Fame of Professional and semi-pro musicians and singers, with a mixture of songs and tunes. I think BD would approve of that one, while some of us humbler mortals might just sit and listen rather than try to join in.