oh, i'm sure the fact that they're all on their own schedules is part of it, but none of these people announce it themselves either, so it seems it's up to the venue or institution they're visiting to publicize, which doesn't happen.
i search online frequently for news items about sesame street and never find anything until someone writes a review in the west podunk weekly. for example, in the past month or so roscoe orman gave a talk in new jersey, christopher cerf gave a talk in mississippi, and linda bove did a book signing in rochester, ny. but i didn't find any of those until two or three days after they happened.
i can't even find appearances of people who have their own websites. sonia manzano has a blog but she only updated it once with upcoming appearances. she has posted more to her political blog. and bob mcgrath has never yet updated his blog. he mentioned two upcoming parades in his inaugural post, but not his appearance with the salvation army band (which Vic Romano missed and has a thread about here), not the william patterson event, not the NEA thing he emceed in washington, and not the show of hearts telethon he hosted in vancouver a couple weeks ago.
basically the reason i joined MC was because i learned of a few events through the fourm--the forum kind of functions like a publicity clearinghouse for henson & sesame workshop. and yet even we, with our geographical coverage and collective obsession, can't find announcements of these appearances...