This Chicago tradition began in 1942. The museum's 45-foot Grand Tree takes center stage in the Rotunda, surrounded by more than 50 smaller trees decorated by volunteers from Chicago's ethnic communities to represent their various cultures and holiday traditions. Stroll through the trees, enjoy falling "snow" and savor performances on the stage. School choral groups perform during the week, and ethnic song and dance performances take place on the weekends. In 2015, the celebration will focus on a robot theme in honor of the museum's temporary exhibition, "Robot Revolution."