In the weeks and months before the Democratic National Convention, nursing staff at Chicago’s Rush Hospital used VR headsets to prepare for mass casualty events, tending to 3D burn victims with floating gloves. Patients with non-life-threatening illnesses and therapy appointments were redirected to Zoom care, ambulance and medical supply truck drivers given security clearance within the Red Zone perimeter.  Secret service agents canvassed neighborhood taquerias, distributing maps and telephone numbers to be called in case of emergency. The convention territory was “geofenced” to allow Uber drivers to enter and exit, and the surrounding streets encased in metal barricades.   Food delivery services, cyclists, and CTA riders could all expect delays; Amazon, trash pickup, and mail service as well. Cook County criminal court closed, and judges moved the cases to Rolling Meadows.…