I have seen thePoster advertising this event; but it is in Japanese. I need help locating the address for the festival in Shinjuku and the calendar events. I only know the dates and opening times of Noon each of those 2 days.
Most jazz festivals in Tokyo don’t have a single venue. According to their facebook page, this one has 27 venues throughout Shinjuku 2-chome and 3-chome - ie. jazz and live music bars. Looks like you need a ticket too.