The value of your cables
There's much debate about whether or not the quality of your cables matters. Whether Mogami cables are worth their exorbitant price tag. In my opinion, Mogami makes the best cables. Monster comes in a close 2nd, and in some cases Monster cables sound better, it depends on the where in the chain they are used. And Live Wire cables from Guitar Center are also decent. Most good cables have a lifetime warranty, so if it shorts out (which it eventually will) you can have it replaced for free.
The best thing to do is to try them and see which ones work best for you.
For more information on what to look for while choosing instrument and patch cables - go here.
Bring your own cables.
Never leave it up to the venue or sound team to have what you need. If you bring an acoustic guitar, ukelele, fiddle, keyboard or any instrument that needs a DI to interface with a primarily XLR based sound board (which is most) bring guitar cables AND a DI. Most venues have a couple of DI's but what if they happen to be not working.
Always err on the side of caution. I see so many disappointed faces when I'm working a gig at a venue that isn't properly outfitted for live musical performances, and has a very paltry, basic PA which I'm forced to use, and an artist comes up and says, "I need a DI."
Get yourself a DI for each instrument that needs one, and bring it. And don't forget your cables.