Conditional labels on event detail page

hi!

I have been searching how to get the same functionality on the event detail page that I get from the location field.

I mean, on the location field, I have this:

        <div class="jev_evdt_location"><span class="location">{{Location Label:LOCATION_LABEL}}</span>{{Location:LOCATION}}</div>

And when the location field is empty, the label disappears. I would like the same behaviour for Extrainfo, description and repeatsummary. How it would be?

Regards