Doesn't look like 50,000 by these pictures.
This event raised a lot of questions in my mind: Why the almost enforced absence of US flags? Why no singing of the Star Spangled Banner? Why no mention of the greatness of America? Why no invitee from the right of the political spectrum? Why was this event not billed as a DNC rally, even though it appeared to be little more than that? Why the emphasis on "hip-hop", gay rights and Palestinian Liberation at a rally commemorating MLK's speech? What do these things have to do with civil rights, which, at this point in time, should be a non-issue?
Because the real MLK had Republican values. They can't acknowledge him, and still get the uninformed to vote for Marx.