If you're sitting stoically in your seat in the Adler Theatre on Saturday night, then Erin Baltsar and the cast of "Girls Night: The Musical" haven't done their jobs.
"We encourage everyone to get up and dance with us and sing along," the 29-year-old actress said in a phone interview. "We really want everybody to have a good time. It's not the show where you're sitting silently in your seat."
"Girls Night" made its American debut in 2007, following five friends in their late 30s and early 40s out on the town.
"It's a big party, it's a good time," Baltsar said, as she and her castmates were circling the parking lot in the Mall of America in Minneapolis.
One of the friends, however, is their guardian angel, unseen by the rest.
"She has been following her four best friends for the past 22 years, although they don't know it, but she's involved in their life," said Baltsar, who plays "party girl" Carol.
The angel serves as the narrator of the show.
"We treat the audience members as if they were patrons at the bar. We break the fourth wall, we talk to them," Baltsar said. "But we're not going to invite them on stage and put them on the spot or anything like that."
The music is classic anthems, mostly from the 1970s and '80s, including Gloria Gaynor's "I Will Survive," Cyndi Lauper's "Girls Just Wanna Have Fun," the Weather Girls' "It's Raining Men" and LaBelle's "Lady Marmalade."
A native of Allentown, Pa., Baltsar has been with "Girls Night" for four years.
"It's a really great gig because it allows us to go out and do other opportunities and then we can come back and do the show again," said Baltsar, who estimates that 50 different actresses know the musical.
"When I'm in New York I want to be working, and 'Girls Night' is there," she added.