Every single job I interview for, I make it explicitly clear that I will never be available to work on Saturdays. I’m not going to go into detail on why but that’s just my work boundary. I will simply never work on Saturdays. My manager has asked me a couple times if I could come in on that day and I’ve maintained my unavailability. Today they told me “I need you to work ___ Saturday in June. We’re having a grand opening and I need everyone there.” I said, “No I cannot work on Saturdays.” And they asked why I can’t so I replied “I can’t work Saturdays that’s why I let anyone I’m working with know ahead of time.” Sidenote…that Saturday also happens to be my birthday so double no.