Agenda view: On this day

[Klaus Thoben]

Hi everyone,
long time orgmode user, but never really did use the Agenda. Now, having
used Memacs quite a bit, I thought it would be handy to have an agenda
view that shows significant events related to the selected day from all
org files.

Does such a function exist already? Or can somebody help me out with
some Lisp code for that?

Thanks in advance,
Klaus