Wow - did Tristano have much to say? If I remember right, wasn't that Harrogate gig the only one he did on that visit to the UK.
Plus of course, Mike Westbrook recorded the 'Citadel/Room 315' at the old Leeds Poly and lots of JATP tours went through both Leeds and Bradford (Alhambra). Those towns were (reet) smokin'
I never heard JATP in Leeds, though I do recall hearing the Ellington band there in the 60s. A friend who regarded himself as hip, but wasn't, spotted the band at lunch in the Queen's Hotel the next day, went up to Hodges and said, "Great concert, Duke!". "Wrong one, man," replied Hodges, nodding in the direction of Ellington.
As you say, Bradford was the place for concerts. At the St George's Hall I saw an EarlHines/Jack Teagarden band in 1957 with Max Kaminsky, Peanuts Hucko, Cozy Cole and Jack Lesberg and two years later a three-band package of the Brubeck Quartet, Dizzy's quintet with Junior Mance and Les Spann and the Buck Clayton All Stars with Emmett Berry, Earl Warren, Buddy Tate and (I think) Dickie Wells. I also recall hearing Lightning Hopkins there in a touring blues package in 1964.
Re club dates in Leeds, the Peel Hotel in Boar Lane used to get the touring stars who also went to Ernie Garside's Club 43 in Manchester. At the Peel I saw Johnny Griffin, Lee Konitz, Cecil Payne, Tubby Hayes, Joe Harriott and Chris McGregor's Blue Notes.