Plenty of singing opportunities at Sidmouth, including Kitty's as above.
Also twice daily -all unaccompanied in the "Middle Bar" at The Anchor, lunchtime and evening. Your turn when the "twig" is offered to you!
Daily themed sessions at The Woodlands Hotel.
Some doubt about the Volunteer this year, where the very trad singing sessions happen: the pub is currently closed while the late landlord's estate is being sorted out: not clear yet if it will re-open in time for the festival.
Evening sessions in the Faulkner also from 8pm: just give your name to the MC on arrival, and you will later be called upon.
Or you can take pot luck in the mixed sessions in The Bedford and The Swan, but it's just just "jump in" there.
And most of these are now listed in the "working programme" - worth buying a copy. Apart from the official listings, they do now include most of the "fringe events" on a separate page or 2.