You know the drill by now, five people ... what's the connection?
A=they appeared together how many times over three decades
B=the number of letters in the name of the person who famously brought them together (two words)
C=the number of letters associated with their penultimate appearance (6 words, arguably their most appropriate appearance to this cache)
D=the number of letters in the connecting Aunt's Christian name
E=the number of letters in the connecting Uncle's Christian name
F=the number of letters in the connection itself (three words)
The cache can be found at : N55 02.Y W001 38.Z
Where Y = ((C + F) x B) + ((A x E) - D) and Z = (C + B) x (A + D - F) + E
You can validate your puzzle solution with certitude.