If you find yourself in the American Midwest this weekend and see a large concentration of identical pairs, you're not losing your mind. Beginning August 5th and running all weekend is the Twins Days Festival in Twinsburg, Ohio.
Twins, triplets, and other multiples from all over gather in Twinsburg for the celebration, which this year has an optional circus costume theme. Events involve contests, sports, fireworks, a Double Take Parade, and a talent show. Researchers also visit the town, inviting twins to sign up for particular projects, which include studies on fingerprinting, facial ageing, infectious diseases, and more.
Concentrai* is a low probability typo that occurs nearly 330 times in WorldCat.
(Image of twins Mary-Kate and Ashley Olsen from IMDB.com)