Namie isn't into crazy gimmicks the only time she celebrated an anniversary was her 15th one like aloopy mentioned, and all she did the Live Style 2006 tour which was such a nice gift for her fans. (if you aren't familiar with the tour she performed many songs for the first time like b-sides plus some of her older hits that don't get performed often). She probably will do something for her 20th though cause that's a pretty big deal but I doubt she will go the "ayu/kuu route" !
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