Dan Weinreb had a different take on the symbolics era and the MIT lab.
It should be too surprising as it took place at the MIT, but many of the founders of Lisp were present. Dan, Guy Steele, Richard Gabriel, JonL White, and so many more. It was really inspiring.
Interestingly, though the ILC is a conference about all flavous of Lisp and its applications, RMS wasn't attending the conference.