"Hi, I'm Bob. Mind if I clamp my mics to your stand once you're all set up?"
Then, while the taper sets up gear, get yours ready to go - mics in shockmounts, mounts on stereo bar, stereo bar on clamp, mic cables attached to mics, etc. - so all you have to do is attach the clamp to the stand and you're all set. This way, if time's tight before showtime, you're not gonna hose the taper running the stand from getting the mics up and flying in time.