A day-page is a wiki-page for a certain day. It has the date in the beginning of its title + it has the name of the day-page set it belongs to attached. For example 2006-05-28_Talk. You can edit a day-page just like every wiki-page.
The central page of a set where all day-pages get included into is called the mother-page of a day-page set. Its title is the name of the day-page set + Pages attached. For example TalkPages.
There are several day-page sets in the collab-editor-wiki.
You can create more day-page sets like _Event, _Agenda, _SubProject? etc. Further calendars in the side-bar like the one for talk can be implemented easily.
To edit a day-page