Saturday night at 7:30 PM the Lyric Opera of Chicago will perform a free open-air concert at Millennium Park’s Pritzker Pavilion in the runup to the opening of its 54th season later this month. Principal conductor Sir Andrew Davis will lead the program, which includes overtures, arias, and ensembles from Bizet’s Carmen, Gounod’s Faust, Verdi’s La Traviata, and many others.