I was told they were having a tougher and tougher time getting volunteers. If I remember correctly the Boy Scouts did the parking as a community service type deal but getting jump judges, ring stewards, bit checks, jump judges, people to set up and take down rings, scribes etc… was getting hard to do. I volunteered the last year it ran. The volunteer coordinator boarded at the same barn. I wasn’t eventing then and was a bit hobbled as I had ACL surgery in June and Radnor was fall. I got to be ring steward so I didn’t have to move around too much. He was pretty desperate for volunteers.
They do have a horse trial there in October but it appears to only be Novice, Training and Prelim.