You already have a decent range. Perhaps look into a macro lens (e.g. 100mm f/2.8 L) to capture detail shots.
Do you foresee having to capture very large groups of people? If so, then a wider angle (wider than 24mm) could be very useful.
While not as good in lower-light, I think the 16-35mm f/2.8 would be way more versatile than the 35mm f/1.4 prime.
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Ricky
Camera: EOS 5D IV, EF 50mm f/1.2L, EF 135mm f/2L
Lighting: Profoto Lights & Modifiers
