Eventing Nation wrote a thoughtful and kind piece about the name and why it was problematic, why it didn’t represent wrongdoing by any of the people associated, but why using the word was just no longer appropriate. I applaud them for standing up and I applaud them for the way they approached it.
A large piece of land called a “plantation” in the US is irretrievably going to be associated with slavery whether that land was worked by slaves or not. Blame the slaveholders who made it so, not the people who were enslaved or the descendants of either.
Changing the name of an event is easy. Full stop. Even changing the name of an incorporated nonprofit is not really that hard. The event could change its name without changing the name of the organizing corporation or the location. (Example a certain 4* in Kentucky.) Name changes happen all the time.
At the end of the day, the organizers, and the property owner, care more about the name than they do about eventing, the people who come to their event, or people who saw the name and thought that maybe this sport wasn’t for them.
I’m sorry to lose this event. But the blame goes to the landowner and organizer.
Why keeping this name is more important to them than disassociating the event from any reference to slavery, I cannot guess.