ProppFrexx ONAIR User-Forum

Is it possible to delete all Event data?

Yes.
Open your playlist or media library as a playlist.
Select the related tracks (or press Ctrl+A to select all). And the right-click to open the context menu.
From the context menu select "TAG and MetaData" -> "Remove All Settings..."
In that upcoming dialog you can check the data you like to remove.

Thanks but what i mean is the data imported in Events/commands.. like webstation events.

No, there are not that many commands events - you must edit them individually.