My suggestion is: buy tea and drink it alone in Your hotel room.
I participated that strange ritual in Ueno park in Tokyo: alot of bling-bling and bla-bla, very uncomfotrable; and ... what is most important: tea is so-so, I would say horrible. Just go to tea shop, buy loose leaf gyokuro tea from Uji, thermometer and timer - that is all what You need.
Ceremony is for people who like ceremony, who does not care about taste of tea ... I think that tea here could be substitued by vodka or cultured buttermilk with the same effect.
Of course, I culd be not right, just 2C