Well I've changed the folder names a bit I've removed any "." in venue names so "Boston.Garden" is now "Boston Garden"
Before the first "." is the date "gd77-05-07" (the gd stands for grateful dead) after the first "." is the source "sbd" after the second "." is the venue "Boston Garden"
Here are a few examples
gd71-08-06.aud.Hollywood Palladium.flac16
gd71-08-21.aud.Mickeys Barn.flac16
gd74-10-18.sbd.Winterland.flac16
gd77-05-07.sbd.Boston Garden.flac16
gd77-10-07.sbd.U of New Mexico.flac16
I have about 250 shows in this format, I have used mp3tag to mass add artist and year tags, but date and venue as album titles looks to be a very tedious cut and paste project.
With a little experimenting and a couple replace functions I was able to tag them all with date and venue as album title. IE "77-05-07 Boston Garden" Mp3tag is a truly powerful tool.