Qi Xu, a 19-year-old pianist from China, will present a program of works by Chopin and Liszt on Saturday at 7 p.m. at the Levitas Center for the Arts at the Southampton Cultural Center. Qi Xu, a Pianofest alumnus who performed at the Levitas Center in 2011, is enrolled in the Columbia-Juilliard exchange program. He has performed in Poland, Ukraine, Germany, France, and Morocco, where he won first prize in the Morocco Philharmonic International Piano Competition.