Duplicate Event to change Goal

I am trying to add to my Calendar a Half Marathon in Valencia.

This will be on October 27th

Some kind user has created one of those including course, but he has setup this as time, not as an distance.

You can check this while looking for: Media Maratón Valencia in GC Web

Question.

Is there an option to duplicate event to allow me to setup different time target?

Is there option to contact original creator of that event, to ask him change that?

Why someone would even define half marathon race as time-based event?