Hey, welcome aboard! Here's what I would say:
First of all, and this is more general and not applicable to every specific tape, but sdb in a small club doesn't always work out the best, because stage volumes of the amplifiers are exteremely important in those settings. So, for instance, let's say the guitarists rig is turned up really loud, your recording will have less guitar (proportionally); You will almost always get overloaded vocals.
That being said, it is still worth doing... so what I would do, if I were you, is have an assortment of cables, to be prepared for most situations- I think if you have a cable that is XLR-> 1/8", RCA -> 1/8", and 1/4" ->1/8", you would be pretty much prepared!
Hope this helps!