Hi,
all prospective attendees of the LibreOffice Conference are
recommended to subscribe to the mailing list
conference@global.libreoffice.org, which is especially dedicated to
the participants. All important announcements will be posted there.
You also can get in touch with other attendees via this mailing list.
You will find information on how to subscribe to the mailing list
here: http://www.libreoffice.org/get-help/mailing-lists/#conference
Cheers,
Stefan