The bride and groom were in the middle of exchanging vows when something landed on David Levi’s head. “I particularly don’t like flying bugs, so you could imagine my reaction when a cicada landed on my head and started moving its tiny legs on my scalp,” said Mr. Levi of Bristol, Conn.

Mr. Levi, the owner of a cryptocurrency investment business based in Israel, let out a scream. “Thankfully, my friend came to the rescue and swatted off the cicada, but it didn’t stop there,” he said, describing a May 25 outdoor wedding he had attended in Volant, Pa. “During the reception, I saw some guests swatting at the air, trying to get cicadas away. I also saw some cicadas crawling on our table.”

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