Mother of the Bride is hired to play a divorce party, but there's a sentimental catch. The couple splitting up is the same couple that hired the band to play their first wedding. Determined to be "wedding whisperers" and keep the couple together, Tommy and the guys have to go rogue from Rutherford's event plan, even if it means losing their jobs. Donald Faison, Ashley Williams, Joanna Krupa and Train lead singer Pat Monahan guest-star.

Rock star Declan Horn approaches Mother of the Bride band members when they are playing at Octoberfest. He wants to hang out with them. So he attends their next event, a Sweet 16 party and a private key party letting his inner-rock animal out.

After a falling-out with Rutherford, the guys are recruited by Roxie's rival event planner – and former assistant – Emily Corgy (guest star Erinn Hayes) to play an "End of the World" party. The guys don't feel good about the career move after learning Tommy and Emily have started dating. Worlds collide when they learn the event they're scheduled to play has been double-booked with another "End of the World" party thrown by Rutherford. Even worse, it's headlined by Mother of the Bride's rival – the Def Leppard tribute band Armageddon It (fronted by guest star Ken Marino). It's a recipe for disaster. Donald Faison returns as guest star.