I always regret not going to J Griffin’s in person book signing at Ray’s Jazz about a year or so before he passed away. Alas, the challenges of train travel to London. I did get to see him in what I think was his last London performance at either RFH or Barbican. I think it was with Bobby Hutcherson - must check.
I saw Witherspoon in LA very late in his career, the year before he passed on. It was one of his final appearances I think - quite possibly his last public one.