I strongly suspect "All of US 2016" is a Democratic astro-turf group meant to pull millennials into the Clinton camp. Their webpage says, "#AllofUs will vote to defeat Donald Trump, because we can’t risk letting a hate-filled billionaire become President. Hillary Clinton won’t solve the problems of our generation, but she’s the only one who can stop Trump."
It sounds a lot like something created by David Brock, who founded "Correct the Record". "All of Us" seems like a democratic front group meant to look grassroots progressive. Their website lets you register, via the Action Network, with the group, but does not include any way to contact the group or give any information on how it was founded.
The person listed as the group's founder in the article about the protest, Waleed Shahid, is the political director of Pennsylvania Working Families Party, which has endorsed Clinton. He also wrote an article in the Nation: It's Time for a Tea Party of the Left
Remember the Tea Party? That was the supposedly grassroots movement that turned out to be an astro-turf group.