Is This Fair ?

So excuse me if i'm wrong i'm not really sure of how this works but if i'm not mistaken, if someone is planning on throwing you a baby shower aren't they supposed to pay for everything? 
Don't get me wrong i'm not stingy and so isn't my husband but his mom is making us a baby shower and i'm not supposed to know about it but my husband did but he didn't ask them to make it for us but he told me he has to pay for the tables and chairs . 
I mean its okay for him to help out but I always thought the person making you the baby shower is supposed to pay for everything ? 

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