What to do about a new job?

I just had an interview at Jewel and though the hiring manager didn't hire me on the spot she told me to call her in the middle of the week and meet with another person she still has to interview. She also talked to me a little about orientation but didn't actually tell me I'm hired. Though work is just as important to me, I also have plans this Saturday and if I get hired do I skip my plans or try to work around my schedule? What can I do?