Seattle Symphony recently launched the public phase of a $20 million capital campaign to raise funds for an extensive upgrade of public spaces at Benaroya Hall.

The fun — beginning at 11 a.m. on Saturday, Dec. 21 at Benaroya Hall in Seattle — includes a jolly collection of musical favorites, costumed performances, and a dizzying array of dancing Santas.

Seattle Symphony plans a $20M update to Benaroya Hall, revitalizing downtown with new entrances, public spaces and enhanced security.

Seattle Symphony musicians will also give pop-up performances around Benaroya Hall, the Seattle Waterfront, and Westlake Plaza. They’ll also play in accompaniment to other events throughout the day.