All good! Honest mistake that makes it easier on them (less hosting) and you, so just be cheerful and honest.

Or, you can always blame a test/friend/imaginary friend and say you need to do X, Y, or Z and need to push back, but be grateful for their hosting.

Remember that they invited you, so you aren't a nuisance. You're a welcome guest. But bring a nice little hostess gift (candle/potpourri/flowers/chocolates).

I'm so glad you have people to be with!

<3,

AC

(EDIT: this from someone who grew up worshiping the "All Holy Martha Stewart" as goddess of etiquette)

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You. You make me stronger.