The best of course would be to train in Japan. There are three dōjōs, one in Nara, one in Higashiōsaka and one in Nagoya, where training is held regularly. Addresses, training hours and contact data can be found at the Japanese site of the Hōzōinryū.
Outside Japan the only place offering Hôzôinryû Takadaha Sôjutsu training on a regular base is located in Hamburg/Germany:
Alster Dojo e.V.
Tel. / Fax: +49 40 - 560 085 95
monday 17:00 - 19:00
thursday 17:00 - 18:00
Everyone interested in Hôzôinryû Sôjutsu is always welcomed to visit the regular training sessions but prior announcement of such a visit either by phone during the Sōjutsu training hours at the dōjō or here would be highly appreciated.
Additionally there is a long spear-weekend once a month, which does not only offer enough time to train the forms of all three levels with various partners, but also to do intensive exercises of basic techniques.
The weekend dates so far for 2019 are:
April 18/19 (uncertain at this moment)
all 14:00 - 18:00 (Sa) and 13:00 - 17:00 (Su) (longer on request)