Oh I found all my grammatical knowledge insecured by this " The lecture hall and performance space was jammed with members of the Harvard community who turned out to hear Damon and watch as Harvard President Drew Faust gave him the Harvard Arts Medal."
"was " should be were. What do you think?
The lecture hall and the performance space are one and the same space. It is a single space that has more than one use. That is why the singular "was" is the correct choice.