feature request: daylist for open dates

Hi, I have some events where the dates are not yet fixed. I want to list them for looking the interest for this.
I would like to have it in a special list.
This could be the day list. But how to choose opendates?

Could be a feature in JEM for J2.5 for later. and perhaps to integrate in JEM 3.0.2+ for J3.

But only, it this is interesting for more people than me.

Loud thinking: I need a possibility to choose opendate. This means: searching for date=NULL in xml
then in models the search for NULL