OK Ian, I might get my hands slapped a bit, but here goes!

Female Folksinger: Mary Humphreys.
Male Folksinger: Johnny Collins.
Entertainer/Heckler: Breezy.
Musician: Andy Irvine.
Group: ChrisHilID (of course).
Horizontal: Piersy-Baby.
Club: Windward at the Comfort Hotel (Fridays in term-time)
Session: The Bull at Barton-le-Clay (obviously).
Festival: Straw Bear.
Songwriter: George Papavgeris.