Is it rude to RSVP and then not show up or cancel?

My baby shower was tonight and my sister threw it and it was soooooooo cute and she worked so hard. She even came from out of state to do it! But almost more than half the people who said they would be there and Rsvp'd didn't show up and it was embarrassing for me and put a damper on the party itself. I tried to be positive and did good but I was super embarrassed.

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