I'd love the info as well on the private signings if possible, since there are quite a few former Mets in the DR that I need for my collection
The guy's name is John Guzman. He's known for doing signings with DR players. I found him on signingshotline.com. I don't think the guy has a website however, but maybe you can get in touch with him to see what he's got coming up or how he can maybe help you with stuff he has left over from past signings. I just rattled off 7 former Expos who live in the Dominican Republic (these last 2 came in late because of rescheduling).
his contact info is here:
Not sure if you can access that page without a membership to signingshotline.com... hopefully it works for you guys.