Oh well, as no one seems to understand... here is what we have built up so far - hope it helps...

England
Avon Avon Folk Diary
Bedfordshire South Midlands Session Guide
Berkshire South Midlands Session Guide
Buckinghamshire South Midlands session Guide
Cambridgeshire Cambridge Folk List South Midlands Session Guide Regular Folk Sessions
Cheshire Chester Folk List Folk Music in Stockport, Manchester and Cheshire
Cleveland Folk Sessions in the North East
Cornwall South West Session Guide
Cumbria Cumbria Session Page BBC Radio North East
Derbyshire Spirefolk Folk Session Diary
Devon Flaxey Green South West Session Guide Folk Activity in North Devon Exeter University Folk Music Society
Dorset This is Dorset Music South West Session Guide
Durham Folk Sessions in the North East
East Midlands East Midlands Folk Pages
East Yorkshire Folk Sessions in the North East BBC Radio North East
Essex EFN - Essex Folk News Song Clubs & Sessions
Gloucestershire Folk Music in Gloucestershire
Hampshire South Hampshire Traditional Music List South Midlands Session Guide
Hertfordshire Lemonrock
Kent Kent Folk
Lancashire Clocksback Trouble at' Mill
Leicestershire Leicester Folk Diary Leicester Folk List Leicester Irish Sessions List Sounds Alive
Lincolnshire Fizgig Folk Guide Lincolnshire Folk Diary
Lincs. & East Yorkshire Folktalk
London Acoustic London Folk London Greenwich Traditional Music Co-operative
Mid West Mr Red's Mid West
National British Bluegrass Association Session List A-Z List of Folk & Blues Venues Hobgoblin What's on Page
North Derbyshire South Riding Folk Network Stirrings
North West Folk Orbit
North Yorkshire Folk Sesions in the North East BBC Radio North East Tyke's Online Club Listing
Northumberland Folk Sessions in the North East BBC Radio North East
Shropshire BBC Shropshire Folk Diary
Somerset South West Session Guide
South Yorkshire South Riding Folk Network Stirrings BBC Radio North East Folk in South Yorkshire
Suffolk Suffolk Folk Guide
Sussex The Sussex Folk Guide
West Midlands Shropshire Folk Diary
West Yorkshire BBC Radio North East

Ireland
County Clare Clare Music

Other
International The Session (Worldwide list of Traditional Irish Sessions) Sessioneer.com (list of folk sessions searchable by country)

Scotland
Edinburgh Gigguide/Edinburgh
South West Galloway Folk

USA
Alaska Celtic Sessions in Alaska
Fla'da Orlando Folk - "Folking Around"
Indiana Indiana Acoustic Music

Wales
North Folk Orbit
South East BBC Folk World