This sounds a lot like the pvp line in runescape. I legit stopped playing that game because I walked near that line not knowing what it was and someone leaped across and one shot me. Fastest quit moment in my life.
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Maybe a better idea would be a pvp zone, like a battleground in WoW but not locked to an instance.
I would actually love some kind of event at the wolves den. It was really awesome the first few days where there was tons of people in the dueling area. Sadly the wolves den is back to being pretty empty and no one is dueling and the CC queue went from 30s to being nearly 10 minutes long sometimes now.