Pics from the pro Trump rally in DC..from Twitter post

[Princess Turandot]

17. It's apparently a 'guerilla' marketing effort for a newish tour of Black History sites in DC...

He does both a day and night tour (which visit some different places relative to each other).

This article is about another event where the guy doing it planted that sign behind where Wolf Blitzer was reporting from outside of the Capitol, so his placard was visible whenever they show Blitzer.

http://dcist.com/2017/06/cnn_guerilla_marketing.php

It is one of two tours that Folden has been running since November, the other being a longer tour of sites affiliated with the Underground Railroad. Both begin at the Anacostia Metro, with a first stop at the Panorama Room for what Folden claims is the second-best view of D.C. The Night Tour then goes on to a number of sites that few visitors ever see—the location of the Snow Riot and a Georgetown cemetery that likely harbored runaway slaves—along with more well-known, if still under-visited locales, like the Frederick Douglass House.
....
To get the word out, Folden says he's been popping up at protests and other newsworthy scenes around town—sign in tow—beginning at the Trump International Hotel on the night the business mogul won his surprise victory. Most recently, he brought it to Trump's "Pittsburgh Not Paris" rally at Lafayette Park on Saturday (you can spot it around the .09 mark in this video, nestled among signs thanking the president and denouncing fake news).

"Wherever there's a whole lot of media in town, I'll be right there in the middle," he says.