It’s the day before Halloween, and they have Colbert running a “countermarch”. I think they’re going to have a little trouble being taken seriously, if that’s even their goal.
My suggestion is to ignore them.
As far as disruption, that's not what I'm suggesting.
What I expect is that they'll have a cleanup crew on the ready with latex gloves on, picking up what a Colbert fan would leave behind. Those would be good pictures, too.