Orson Scott Card's Vroman's signing got canceled due to illness. I hope he feels better soon!
In the meantime, check out his new YA novel:
Only his father knew that Rigg possessed the power to see deep down the paths of people's pasts. But it was only after his father died that Rigg discovers that he has another special gift: the power to change the past. Unfortunately, with that knowledge, all certainty and safety began to melt away. Thinking of it as a coming-of-age novel at triple speed.
Pathfinder is Book 1 of the Serpent World series.
Check out my review for Ender's Game. I really loved the audiobook.