Were I turned out of doors at Stirling Street with a full-frame Nikon mirror-less camera and one lens and forbidden to buy more. I would request my banishment be with the Nikkor 24-70mm f:4 S-series zoom.
It really does seem to be the lens that could do anything. I observe this in their DSLR series as I watch a friend exercise himself with a new D850 and their a lens of similar range. There really doesn't seem to be anything the average shooter cannot accomplish with this sort of combination. Certainly, if it were combined with a dear old SB-700 flash it could work forever making money at events and weddings. In this respect, the higher ISO capabilities of the Z-series cameras and the flash power would conquer most indoor spaces.
If you are inclined to scoff at the universality I'm advocating on the grounds that you only shoot by available light or demand the out-of-focus appearance that a wider aperture gives, remember that there are events and venues in this town that have neither lights nor backdrops no matter
where you look - and if you are going to get an image out of them you might as well shoot at f:4 and light it yourself. At least you might get a chance to choose the white balance for yourself for a change and shoot at a shutter speed fast enough to stop the shakes.
The lens also has the advantage of weighing only 500 g. Weight seems to mean nothing to you when you're starting out for the show but wait till you get to the bit where you're coming home. Also consider what you'll feel like if this becomes your travel lens. Every 28 g. you save means you can walk 1.6 Km further and that might just get you back to the hotel bar in Happy Hour. Priorities...
You can splash out for a 24-70mm with an aperture of f:2.8 if you wish - this means more weight and size, but you might be young and fit. For me this 24-70/4 would be the ideal - and it looks a lot like the newer Hasselblad lenses in the days of their focal plane film cameras - sleek and easy to use.
Note: for those who need to get a grasp of the focal length equivalents for the APS-C cameras - you want a 16-55 for your sensor. More depth of field but you'll probably get the same maximum aperture.