Plot summary
It's Alexis' graduation day and David's birthday, the latter of which their parents forgot. Alexis tells her family she does not want them attending her graduation so they quickly make their own plans; Moira and the Jazzagals have a singing event, Johnny celebrates fully booking the motel for the first time, and David is invited to a birthday dinner by Patrick. When Stevie shows up, at David's request, she realizes Patrick had intended the dinner as a date so she tells David and makes an excuse to leave them alone to an enjoyable evening.
Ted shows up at Alexis' graduation ceremony, which surprises her because she quit his vet office earlier after seeing the applications of more qualified people and she wanted to find a job more suited to her talents. After her mother and the Jazzagals make a surprise appearance at the graduation, and David and Patrick share a goodnight kiss, the Rose family gather in the evening to celebrate both Alexis' graduation and David's birthday.
Credits
Adapted from Wikipedia contributors, Schitt's Creek season 3. HTML formatting and reference markers removed.