James Alexander Barr & Louis Parker used to go out with their mobile disco called "The Disco Roadshow". Louis used to DJ at Penrhyn Old Hall with his then wife Val, they were known as "King Louis & Val". Louis went on to form a Management company in London that used to manage major acts including Boyzone, and he was responsible for bringing many big name boy bands / groups / singers to the Rhyl Pavillion Theatre. I don't think he made a huge amount of money from doing that. I phoned him one day at his office and he said it gave him an excuse to come 'home'. Louis used to buy records from me back in the 1970s.
The major act that didn't turn up was, and I may be wrong, Robert Knight of 'Love On A Mountain Top' fame...Or it may have been George McCrae in around 1974/5.
As for the Palace, back in 70s it was Gilbert Gillan and Robert Redhead who brought Sweet Sensation there. They used to have a record shop in Madoc Street, Llandudno on the upper floor of the catring shop I think.