Miss Manners: We were invited to a birthday celebration three months from now, when must we RSVP?

DEAR MISS MANNERS: A close friend texted to see if my husband and I were available on a certain Saturday, three months out, to celebrate her husband’s milestone birthday. She’s thinking of having a dinner at a downtown restaurant for about five couples. (We’ve done similar events for other milestone birthdays.)

My husband and I disagree on the etiquette of how long we have to let her know if we are free. What’s appropriate?

 

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