Singing hope
K.M. is a 23-year-old singer from Sweden with some 8 years performing experience who would love to sing at jazz clubs, corporate events and private paries. "How can I get in touch with the right people?"
First, you need to live here and be prepared to put in time and effort. The jazz scene in Japan in general is small and cultish, and managers and venues limited.
Japanese weddings do not feature singers (Well they do as the festivities wear thin, but it's called karaoke). As to corporate events and parties, well, good luck. I suggest that you begin by networking at The Ruby Room in Shibuya.