Tea ceremony - is a matter of simply boiling water, making the tea and drinking it.
Tea ceremony is just drinking a bowl of green tea, but it has been located in a center of Japanese culture since Okakura Kakuzo introduced it to other countries by "A Book of Tea" about 120 years ago. It is said that tea ceremony gave strong cultural influence to Japanese cuisine, calligraphy, pottery, flower arrangement, architecture, etc.
There are several places in Tokyo where you can taste powdered green tea(maccha) in a traditional mannar, for example in some authentic hotels or public Japanese gardens. It is simple and easy. You just sit down a chair, then a bowl of green tea is served (The price is normally around Yen2,000/head, but it is sometimes exclusive for hotel guests.) You do not have to know traditional manners of tea ceremony at all. Frankly speaking, it is far from a spirit of real tea cermony, but it can be a good opportunity to experience the taste of powdered tea and interesting for you.
But if you have experienced tea ceremony to some extent before, you may prefer more authentic one such as sitting on Tatami mat, watching professional host making a bowl of tea in front of you. If you feel so, I will be able to set up a real tea ceremony specially for you and your group at a real tearoom in private house located at peaceful Tokyo residential area. The host is a tea ceremony master of Urasenke school. It is also possible that we also prepare tea-ceremony-style Japane cuisine (Kaiseki) in addition to serving tea. Please contact me for details.