There's normally at session

At the John O'Gaunt pub in Sutton

On the Beds/Cambs borders near Biggleswade

http://myweb.tiscali.co.uk/markii/suttonfolk.htm

&

Unicorn Ceilidh at Hitchin town Hall

Hertfordshire

Google - I can't remember details

http://www.unicornceilidhs.org.uk/index.html