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At this international 'Cat Expo' there will be over 200 cats. If that's not enough, there'll also be a multitude of quirky cat vendors, an eventwide cat competition to rival Crufts, famous cat lovers like 'A Streetcat Named Bob' author James Bowen, and famous cats, like Bob. There'll be Instagram celebrity cats too, and regular cats of all shapes and sizes. Basically, it'll be the perfect feline-heavy day for any put-upon Londoner. Unless they're allergic to cats.