PDML is a mailing list run by JPDU and informs of official schedule and entry of principal matches in Japan.
Anyone who is related to debate can register.

How to register your e-mail address with PDML
0. If you don’t have any Google Accounts, create one at https://accounts.google.com/signup?hl=en
1. Visit https://groups.google.com/forum/#!forum/jpdu_pdml and join PDML Group.

・Your display name is your e-mail address by default and
can be seen by anyone in the group, so we recommend you rename your display name.
・Tick “send me an email if there is a status change on my post or topic” in “my global settings”.

How to post to PDML
You can post to PDML by sending e-mail to jpdu_pdml[at]googlegroups.com
After giving approval by manager, your post will be sent to everyone in the mailing list.