I have a few times, but not really into the city centre, my friend used to live on outskirts so only really local to him
Same as any city centre though I imagine
it its only 30-40 mins from Derby to NEC straight down A38 or M42 but I get back from hols the day before so I dont think the missus would be too open to people crashing at ours or I would suggest a Peaks or Cannock ride and Derby beers then cycle show on the sunday
(we could maybe do that ride and beers some other time though anyway)
For £11 tickets quote STM at
www.cycleshow.co.uk/stm