I'll mark this thread in hopes we can join in some of the festivals someday. Here are some of the festivals mentioned in Tattie Bogle's list.

http://www.celticconnections.com/
http://www.tmsa.org.uk/
Northern Streams
http://www.girvanfolkfestival.co.uk/

Cut and paste links are here:

http://www.shetlandfolkfestival.com/
http://www.moniaivefolkfestival.co.uk/
http://www.orkneyfolkfestival.com/
http://tmsakeithfestival.blogspot.com/
http://www.stonehavenfolkfestival.co.uk/
http://www.hebceltfest.com/
http://www.innerleithenmusicfestival.org/