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Every time I host or attend an event, I’m astounded at how terribly inconsiderate some people are — multiple last-minute cancellation texts or guests who’ve simply gone MIA have become all too common.

Jamais vu is the opposite of déjà vu. It’s the feeling that something familiar is suddenly strange or unusual. It’s the feeling I get when I mix friends. A friend of 15 years, Heather, revealed her ...