He just did a signing this past weekend for the Imperial Walker Ink group on Facebook. This was the signing where he signed the RS plaques. I had two other plaques signed by him as well. From what I understand, Nilo signed the eFX plaques years ago but has been pretty reclusive from the Star Wars scene since then. IWI founder Hector Cruz has already said that Nilo had such a good experience signing this past weekend that he wants to do another signing next year.
Imperial Walker Ink is an amazing group, and Hector Cruz goes out of his way to give us some amazing ILM signings. Marcia Lucas, Jon Erland, Bill George, Dennis Muren, Phil Tippett, and Jon Berg just in the last few months. Steve Gawley, Ken Ralston, and a bunch of ROTJ ILMers are scheduled for June. I urge everyone interested in collecting autographs to join the group.