As someone who's chronically early... If it involves travel of any kind in a US city (9am meetings imply that), sorry, lateness is a given. 10 am, 11am, etc, no

As someone who's chronically early... If it involves travel of any kind in a US city (9am meetings imply that), sorry, lateness is a given. 10 am, 11am, etc, no problem being draconian, unless it actually involves inter-city travel (i.e. not employees - in the sense that they're people who know where they're going). If you're asking people to go to a place that you're familiar with and they're not, just assume they're going to be twenty minutes to half an hour late. I've lost track of the number of times my GPS has guided me around a circle for 15 minutes, or up to a detour sign, or to turn left on a no left turn sign.