Advent Carolndar performers and Broadway veterans Joel Waggoner and Julia Mattison are taking the reigns of Playbill's Instagram for a special takeover December 10. Make sure you're following @Playbill to get a special dose of theatrical holiday cheer.

The pair is set to bring their new holiday tradition to Chelsea Music Hall for a pair of live performances December 12, with a streaming variety special set to premiere at midnight December 13. The live shows will feature songs from three years of Advent Carolndar along with one-time-only improvised carols.

Joel and Julia’s Haunted Holiday Singalong!, directed by Nathan Chang and produced by Halleloo Productions, will feature The Playbillies as well as such tunes as "On the Brink!," "A Very Sondheim Christmas," and "Stable Girl."

To pre-order the streaming variety special, click here. Tickets for the two live performances at Chelsea Music Hall are on sale here.