Several concerts on the just-concluded 2017 Ravinia season were devoted to the music of John Adams in celebration of the American composer laureate’s 70th birthday year. But there is another Adams in town, John’s son Samuel Adams, who is beginning his third and final season as composer-in-residence at the Chicago Symphony Orchestra. Along with co-composer-in-residence Elizabeth Ogonek, Adams is also co-curator of the CSO’s MusicNOW series, which is celebrating its 20th anniversary this season.