It's highly unlikely that Terry will be doing any more signings mainly due to his illness. It's also part of the reason that he dictates the books these days rather than types them. Pretty much the only way to get a signed copy is from PJSM Prints
where he signs a limited number of copies as and when he can.
Otherwise the only thing to do is to buy pre owned signed books.
Wyrd bið ful āræd.
"Coffee. The finest organic suspension ever devised. I beat the Borg with it."
- Capt. Kathryn Janeway