Improve single day process steps (i.e. for important meetings)

Is your feature request related to a problem? Please describe.
Many of our participatory processes have very important large events, which either mark the beginning of a new phase or where relavant things happen, so that they need to be part of the process phases. Right now, it is not possible to select single day process phases

Describe the solution you'd like
As a minimal solution: Enable the possibility to select single day steps (i.e. as checkbox) -> where the date is not displayed as a span, but just one date is shown.

As a fancy solution it would be nice to select an event, which would directly link to the event (or conference) in the Step Titel (and no description text would be required or rather, the desription text of the meeting is copied)

Describe alternatives you've considered
Linking to an event in the description is possible. However, the time span für one day looks weird.

Does this issue could impact on users private data?
No

Funded by
Maybe Zürich, if no one else is working on it.