Free Performances, Events, Music and Family-Friendly Activities Marked Day-Long Celebration Segerstrom Center for the Arts opened its new Julianne and George Argyros Plaza and Center for Dance and Innovation on Saturday, October 28 with music, dancing, performances, family activities, bands and more from 11 a.m. until 10 p.m. More than 10,000 people and families from around the neighborhood and throughout Orange County explored the 56,100-square-foot plaza designed by Michael Maltzan, with its spectacular fountain entry, the grand spiral staircase that wraps around the new Center 360 outdoor café, leading from the Segerstrom Hall terrace to the plaza, shaded seating and…