There is no dress code for Kabuki performances, but be aware that Japanese audiences do tend to dress reasonably nicely, with men often in suits and women in dresses or kimono. Decent attire is appreciated.
Eating and drinking are allowed in the theater. Food and drink may be brought in from outside, and the theaters themselves offer a wide selection of bento boxed meals, sushi, traditional sweets and other items, which audiences can enjoy at their seats. The Kabukiza has a number of restaurants offering prepared meals during the long intervals between acts (reservations here) and will deliver meals upon arrangement to those in the special first-floor sajiki box seats. There are also food shops in the basement floor of the Kabukiza just outside the subway exit.
Kabuki theaters offer an abundance of souvenir shops encompassing not only theater-related memorabilia (including English-language books and subtitled DVDs) but also local delicacies, traditional sweets, printed hand cloths, fans, Japanese writing paper and more. The Kabukiza boasts branches of famous shops on each floor open exclusively to ticket holders as well as an extensive shopping area in the basement linked directly to the subway exit that is available to all.
The Kabukiza Gallery on the fifth floor of the Kabukiza Tower allows visitors an up-close look at stage costumes, props, instruments and scenery used in Kabuki performances, along with short videos of Kabuki performances. English-language translations of the exhibits are provided. The venue also hosts occasional special exhibitions, talks and live performances. Entrance is ¥600, discounted to ¥500 for visitors with Kabuki tickets. There is also an adjoining rooftop garden and café serving matcha and traditional sweets.