Salt Lake City is more than just mountains and religion. When Jen throws a Tongan themed birthday party for her close friend Meredith, it's anything but a celebration when she confronts Mary about insensitive comments made about her family. Heather discovers that her longtime friend from college, Lisa, has been spreading rumors about her. And after years of judgement and scrutiny, Whitney finally has her dream wedding with her dream guy.

Meredith's birthday party comes to an icy cold ending when Jen and Mary get into a heated argument about Mary's insensitivity towards Jen's aunt, and Whitney confronts Lisa about an incident at Whitney's vow renewal. While Meredith battles marriage problems and Whitney helps her dad through a difficult time, Heather invites all the women to a ski day, which starts out well, but goes downhill when Whitney and Heather confront Lisa about her judgmental behavior.

With the ladies operating on a "clean slate," Whitney plans a roaring 20s party. Heather hosts a baby shower for five of her young, Mormon, pregnant employees, Meredith and Mary grow closer, and Jen acts inappropriately at a nighttime gathering. Later, when Meredith cancels plans, Jen begins to grow skeptical of Mary's involvement and questions Meredith's friendship.

At the conclusion of Whitney's 20s Party, Jen's explosive temper reaches a boiling point and Meredith and Mary are the targets. Meredith finally reveals the truth about her marriage to Lisa, while Jen shares the details with Heather, who then tells Whitney. Mary takes the high road and invites Jen to her luncheon hoping to squash their issues for good, but when Jen tries to open up to the group things take a sudden turn for the worst.

Mary's luncheon ends in disaster when Jen accuses Mary of being racist and Mary accuses Heather of being two-faced. While Whitney deals with her daddy issues, Meredith's marriage problems escalate and Lisa reflects on her own marriage. Heather, caught between two friends, attempts to smooth things over with Mary who is still hurting over the things Jen said about her.

When Sundance arrives to Utah, it's nonstop parties and celebrations for the ladies. When Whitney throws her husband, Justin, a 52nd birthday party, Jen and Mary finally call truce. Meredith helps her son Brooks prep for Salt Lake City's very first fashion week while Heather is on the prowl for a one-night stand, with the help of Vanderpump Rules' Utah natives Lala and Katie to assist. And while everyone is partying, Lisa is too busy planning Sundance parties for everyone else in Park City.