Green Day will induct G'n'R into the Rock and Roll Hall of Fame next weekend. So far, Slash, Steven Adler and Duff McKagan are the only members confirmed as attending. I would wager Gilby Clarke will be there, as well, even though he isn't part of the line up being inducted. He's still on good terms with most of the band and he lives here in Cleveland.
Edit: Looks like everyone except Axl and Izzy Stradlin may be attending.