What to expect from ABC’s ‘Mixed-ish’

Ad Age’s Coming Attraction offers brief previews of TV shows, movies and more of interest to marketers and media people.Tonight at 9 p.m. ET on ABC, Dr. Rainbow Johnson—anesthesiologist, mother and “Black-ish” main character (played by Tracee Ellis Ross)—will be throwing it back to the summer of 1985 and returning to her adolescence in spin-off series “Mixed-ish” that will explain her unique backstory.For the uninitiated, Emmy-nominated “Black-ish&