Baby shower registry freak out!!

It’s like two weeks till my baby shower and I’m freaking out no one has bought anything yet. I wanted to buy heaps of things months ago but everyone kept telling me not to worry because I would end up getting all that stuff at my baby shower. This is my first baby so I feel so unprepared. My sister suggested posting on my baby shower Facebook invite how to buy things for the registry, because people might be confused on how to do it. But I’m not sure how we would word it, like I don’t want it to sound rude.