My wife & I crossed the pond to NYC to catch a couple of shows.
So, rather than decide which DSLR body to take, and therefore which lens/lenses to take or not (I've a range that covers 15-500mm), I took a G10. The lens gave me 28-140 equivalent, and I was just fine with that.
Had I been on a Photographic expedition rather than a Theatrical one, then it might have been a different story.
If I'd done the same trip 35 years ago, it would have been a Leica IIIc, a collapsible 5cm F2 Summitar, Weston Master and a pocket full of Tri-X. The Nikon F and lenses would have stayed at home.
My poiint is keep it simple. The 24-105 on your 5D will probably do just fine. If you need to get closer/further away, just zoom with your feet if you can.
It's amazing how years ago people managed quite nicely with a single fixed focal length lens.
If you're really stuck then I'm sure a visit to one if the better NY photographic outlets will easily satisfy your needs.
Well, if your good lady is spending, why shouldn't you?
(And you'll probably need as much free space as possible to carry the purchases)
Enjoy the trip!
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KenC