Scared their going to give my job away. CAN SOMEONE HELP ME

I finally got orientation at Walmart. I have been applying like crazy and I want to have a job before I start college just to earn a few extra bucks. Well they said orientation was tomorrow at 10 am but I have school so I asked another day and she said Saturday, now that I think about it she didn't tell me a time I don't think.  and I said I could do that day, I'm just scared she probably called someone else, I called her right back and they said it was closed for the day. Should I just show up for the Friday one ????