It was held on 10 Dec 2017, and Suda Masaki was the special guest as he was portraying Ii Manchiyo / Naomasa in 『Onna Joushu Naotora』 then.
(password hint: the url of the homepage. change to the usual extension after unzipping.)
For those who can read Japanese (or simply take a look at the photos), the final guide to the story can be found [here].
(password hint: the url of the homepage. change to .pdf after unzipping.)