> Could you please explain what site notices mean?
I haven't used them before, but it seems like they provide a way to post notices for particular sessions, dependent on the custom field values for that session. So if you have some special instructions that apply to a particular session or group of sessions you can use it to inform the attendees.
Apparently the notice appears in the new version of the face-to-face block (not yet on moodle.org but available here: http://git.catalyst.net.nz/gw?p=blocks-facetoface.git;a=summary ).
> Currently they can only be defined as one phrase. In a multi-lingual site this may be
> problematic as different users using different languages may need to see different translations
>of the field.
This is a difficult issue, because at the moment there is no way to add new language strings using the language string editor, so if you create a new custom field there's no way to create a language string for it.
The session custom fields is based off the User profile fields code, so presumably this is also a problem for user custom fields too?