Above: John Tesh brings his big band to Columbus Park, Wednesday, July 6, to kick off Stamford&amp;#8217;s Downtown Special Services District&amp;#8217;s new &amp;#8220;Jazz Up July&amp;#8221; music festival. Concerts will continue every Wednesday through July 27, when Roberta Flack performs. Stamford&amp;#8217;s Downtown Special Services District will launch its new series, &amp;#8220;Jazz Up July,&amp;#8221; at 6:30 p.m., [...]