Version:            (using KDE KDE 3.1.3)
Installed from:    Debian testing/unstable Packages

Tim Jansen has done some UI work on KOrganizer and modified the look of the agenda to the following:
http://www.tjansen.de/blog/pics/after2.png

Evolution has already taken this a step further:

Please check out the Screenshot @ 
http://codeblogs.ximian.com/blogs/evolution/archives/images/tigert-calendar-mockup.html

Maybe displaying (some) of the note too might be an option for KOrganier agenda too, 
however when doing this, the location might be more important.

Maybe this layout could do the trick

<header line>time of appointment (as in your patch)</header line>
<bold>Name of Appointment</bold>
<italic>location</italic>
<br>
<normal text>Notes for as long as it fits in</normal text>

Cheers,
Thorsten