"I've been here four or five times before," Line said, "but I haven't been back for a few years. We added 11 new cities on this tour."
"Immanuel" features the song "O Come, O Come Immanuel," but includes many holiday-centered numbers.
"I'm playing a little from the Nutcracker," she said, "and a couple of things that aren't really popular, but very beautiful."
Other pieces include "March of the Kings," "March of the Toys," "Foom Foom Foom," and even Willie Nelson's "Pretty Paper."
Sunday's concert will begin subtly, but will include many costume and theme changes.
One costume, in particular, was made specifically for Line 11 years ago, and has been resurrected for the tour.
"It's a one-of-a-kind dress," Line said. "I pulled it out of my closet and said 'It's been enough time, I think I should try it again.' I slipped it on, and it still fit perfectly."
Traveling with Line is her accompanists - a bassist, a violinist, a guitarist, a trombonist, and a drummer - nicknamed the "Fab Five."
Line has been touring for the past two decades, and she admits she "loves the routine."
"It's kind of like living in a bubble for awhile," she said. "We enjoy it. It's a lifestyle for us."
When she is home, however, Line "loves to cook, loves to garden."
"I want to try to do a bit of recreational travel this year," she said. "We're empty nesters now, footloose and fancy free."
Much of her time, however, is spent working on her next project. She tries to release two music books and two albums each year.
"I'm always planning ahead, always working to put together the next project."
She began working on the "Immanuel" tour almost a year ago, sitting down to write the music as early as August.
"It's great being able to execute what you've been working so hard on," Line said. "A lot goes on before you get on stage."
The stage time, Line noted, is another highlight of her tour.
"It's the cherry on the sundae," she said.
On the "Immanuel" tour, kids aged four to 15 are asked on stage to help act out the "12 days of Christmas." Santa will also make an appearance, played by Line's husband, Tim.
"He's been doing it for 15 years," Line said. "It's the highlight of the show."
Tim will also play the part of the Bellmaker, which reflects the overall theme of "Bells."
One joy of touring, Line said, is "reconnecting with the fans."
At a concert in Appleton, the ushers consisted of a group of women who had been following her for ten years.
"They told my assistant to 'Go back and get our girl ready!'" Line said. "They said it was the best show they'd seen."