Captain Freeman is helping to negotiate the Ferengi joining the Federation. The Lower Decks crew are on Guidebook Duty down on Ferenginar.

Mariner joins Quimp and gets into a bar fight. Boimler bing-watches Ferengi TV. Rutherford and Tendi pretend to be married. Oh, and Rom and Leeta are back from Deep Space Nine.

I summarize the plot and point out and explain all the references so you don’t have to