I couldn't honestly say which one thing is the best thing I've ever seen in a folk club but here's a short list of things I remember from the past 30 odd years

Hedgehog Pie
The Hot Pot Belly Band
the first time I ever saw Bernie Parry
Jeremy Taylor
Planxty
Christy Moore
Andy Irvine
Bernard Wrigley
Mike Harding
Gary & Vera Aspey
Irish band 'Burnt Peat' featuring on accordion none other than the man you catters love to hate DAVE BULMER