It's an annual New Year's ceremony and a joint practice session of all the major martial arts. Admission is free.

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Filename:	bu300e-20150112-8994.jpg
Album name:	philbert / Budokan Kagami-biraki 武道館鏡開き式・武道始め
Keywords:	tokyo / chiyoda-ku / budokan / martial / arts
Filesize:	21 KiB
Date added:	Sep 20, 2016
Dimensions:	400 x 267 pixels
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IPTC Copyright:	PHOTOGUIDE.JP
URL:	https://photoguide.jp/pix/displayimage.php?pid=59947
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The Budokan is near Kudanshita Station on the Tozai subway line.