I have info on these clubs for the IOW:

NEWPORT (IOW)
Downland Folk Club. Second Friday of the month. The Castle Inn, 91 High St,
Newport, Isle of Wight, PO30 1BQ Email: downland @miskinfolk.co.uk

Stag Inn Folk Session. Third Tuesday of the month. The Old Stag Inn, 2, Cowes Rd, Newport, Isle of Wight PO30 5TW.

NITON (IOW)
Buddle Inn Folk Session. Weekly. Fridays. The Buddle Inn, St. Catherines Rd, Niton, Ventnor, Isle of Wight, PO38 2NE.

And this session:

ARRETON (I.O.W.)
The Dairyman's Daughter. Tuesdays. Weekly. Main Road, Arreton, Newport, I.O.W., PO30 3AA.

I haven't checked these for a bit so check yourself before you go a-roving! :-)