Pele is in the UK next week, doing a charity footy match at Stoke City, with Gordon Banks, maybe he would be encouraged to do a signing if it was for charity?
Also, with regard to another post about Bobby Charlton, I have heard a rumour he refuses to sign photos that have been signed by the other '66 players, he doesnt want to be associated with it, thats why he doesnt attend the reunion evenings and signings.
Beckenbauer, Cruyff and Eusebio would be great ones to see...
I'm not sure how much of a barrier that would be. I could be wrong but I think A1 sporting speakers supply most if not all the guests for Sportsmania. Certainly a good proportion of the guests are on their books and they maintain quite a visible presence at the show.
I suspect though someone like Pele, if he agreed to do a public signing at all would probably be better suited to a more controlled environment like an Autographica.