I caught this last month in California.

Guess who made a surprise guest appearance during the jam session
as the *fourth* guitarist....

Neal Schon.

I'll have to admit that after that I was wondering if Santana and perhaps Alex Lifeson
were also waiting in the wings to come out and "give it that last
little push." (Santana because he's local. Lifeson because, well, he's Lifeson.)