Should I?

My Aunt just called asking if I was serious about maybe working every other Saturday. Apparently another person quit, which puts them in jeopardy. I can't work this Saturday, I'm going to P.A. with my family the whole day and I can't work in the evening next Saturday..there's a ballroom dance I've really been looking forward to. Should I do it? I mean it's good money, no doubt about that. But do I really want to give up some of my Saturdays? Of course it's only temporary, until my aunt can find two new workers... I think I'll give it a shot?