There probably is research showing how much attendees love to meet in walkable cities, but all you really have to do is think back to a meeting you attended where the convention center and hotel was within easy range of shops, restaurants, and maybe even a little green space. Now think of a meeting where you felt more or less marooned without a shuttle bus. Most people -- all other things being equal -- would choose the first option.If walking is important to your attendees, there is a tool called WalkScore that allows you to gauge the walkability of properties you are considering for a meeting. It's not perfect -- it doesn't factor in crime rates, for instance, or distinguish between the length of city blocks -- but it's a good starting point. (I plugged in the addresses of the last two hotels I stayed at, and WalkScore's assessment was spot on.)