For their induction into the Rock and Roll Hall of Fame, Pearl Jam invited all of their former drummers to the ceremony, but drummer Dave Abbruzzese is still bummed he was not inducted with the band as an official member.
Dave complained about it in some Facebook posts when it first went down, but then went silent when the band invited all the drummers to join them. Dave felt that their tweet wasn't really an invite to join them, but more simply just welcoming the idea of having all the drummers there.
As far as the drummers that were there, Matt Cameron and Dave Krusen were officially inducted as members of the band. Drummer Jack Irons was there and joined the band on "Rockin' in the Free World" during the finale. Drummer Matt Chamberlain didn't attend because he said he had a previous commitment that same night.