DC Chapter leadership is working diligently on that issue. As of now, the Park Service's plan includes a no-man's land buffer zone between the two groups, and the use of high vinyl construction fences to separate the groups as well.
I figured the type of plastic or snow fence, but what a lot of work if just separating by streets would work.
Take care.
I just heard we are having our own event here in town too!!!! Hooray!