Gosh there have been so many memorable sets but 2 I remember fairly vividly were:
Gary Rushbrooke at a Todmorden all dayer one bank holiday (must have been early 80's?)- I was just getting into the scene properly and every thing he played was brilliant. That was also the day I first heard the Rose Valentine & sisters 3 track by Richard - amazing day!
Ady at a Winsford niter - I remember he was playing lots of that great RCA stuff and stacks of other top drawer sounds, the floor was packed througout his set and when out of the blue, he played the Tams, the place just erupted - I've never seen a reaction like it.