I have created two diary entries, I can't see them in the week agenda. Why is that? Also I would have expected 11/15 to be highlighted, or something like that, to indicate an event was planned that day.
I didn't know Org Agenda can work with Diary since they are two separate apps. Then I searched the org manual with keyword
diary, and found this on (info "(org) Weekly/daily agenda"):
In order to include entries from the Emacs diary into Org mode’s agenda, you only need to customize the variable
(setq org-agenda-include-diary t)
That variable defaults to nil.