Calendar/diary: show holidays with no events

[nunojsilva]

Hi,

I use the calendar in Emacs (M-x calendar), and I get lists of events
with "d" (diary-view-entries) in the Calendar buffer, frequently
spanning several days (using the numeric prefix).

Currently, this only shows days that are holidays if they have some
event (diary-list-include-blanks is nil).

But I would like these lists to include holidays with no events,
while still excluding days with no events that are not holidays.

Is there some way to do this short of hacking the code?

(diary-display-function is diary-fancy-display, in case that matters.)

-- 
TIA,
Nuno Silva