Ability to change show description for individual events

For panto we have a relaxed performance and a preview, because the text (Description) is different from the others for these we currently have to create a new and separate show for these occurrences.

It would be good if there was a way in the event settings for the different event if we could make custom show details with custom information that overrides the main one .
This would mean that the relaxed performances are still part of the same show and make reporting easier (especially event settlement report).