The entire Pearson family gathers at Randall's for an unusual party. Kevin and Sophie's relationship deepens on the night of his play's premiere. Kate struggles to open up to Toby about her father's death. Tensions are high between Jack and Rebecca as she leaves on tour with her band.

It's the Big Three's 37th birthdays. Randall and Beth debate a big life change, Kate takes the first step in pursuing a new passion, and Kevin balances the demands of his career and relationship. Meanwhile, Jack and Rebecca deal with the fallout of their big fight.

Kate visits Kevin on the set of his movie. Randall and Beth get exciting news. Rebecca tries to reconnect with Jack.

Kate and Toby go to Las Vegas for their bachelor/bachelorette parties. Meanwhile, Jack and Rebecca celebrate their wedding anniversary.