Lawyers challenging Sacramento’s handling of its downtown arena project argued in court Friday that the city is grossly underestimating the number of people who might show up for an event and the resulting traffic congestion. They contend as many as 31,000 might attend a major event, if the Kings allow standing-room-only admissions inside the arena and if the plaza outside is packed with people as well. Rob Rothblatt, Design Director for AECOM, makes a presentation to the Sacramento Bee Editorial Board outlining the design plans for the construction of the downtown arena on January 27, 2014.