Some of this is still developing, and there are still conflicting reports, but here's what definitely happened:

Barring the Doors to Bernistas:
800 of Bernie’s best volunteers traveled to Philadelphia because they were told that they would be given credentials to be on the floor of the convention. At the last minute, when Bernie’s name was to be entered into nomination, their credentials were denied. So much for welcoming “New Blood” into the “Big Tent”.

Disrespecting Senator Turner:
Ohio State Senator Nina Turner, one of Bernie’s most powerful and energizing surrogates, was scheduled to enter Bernie’s name into nomination. Following Nina’s fiery speech at the People’s Convention, Tulsi Gabbard nominated Sanders instead, and did a decent job that emphasized “Love”, not revolution.

During the roll call, Nina Turner may or may not have turned in her credential and been ejected from the convention. Common Dreams posted that Turner’s credentials were stripped from her; Ben Jealous, former head of the NAACP and another Bernie surrogate, tweeted that Turner’s credentials were not stripped. What is certain is that Turner did not nominate Sanders, although that had been planned; that she did not stand with the Ohio delegation for the roll call vote; and that, by request of the Clinton campaign, both Turner’s and Rosario Dawson’s video segments in the Sanders video were edited out.

Senator Turner herself is expected to clarify what happened today, Wednesday, July 26, 2016.

The walkout: A secretly organized walkout of Bernie supporters left the DNC hall after Bernie had said that Hillary “should be selected” as the Democratic Presidential nominee. 500-1000 (depending whom you believe) left the hall, leaving many empty seats at the height of the convention. (see [video:https://youtu.be/zGRo1mH2_8w width:420 height:315]). Some of the "walkouts" occupied the media corridor; some joined a large protest march down Broad Street. The DNC had been prepared for this, and brought in “fillers” to keep the illusion of a full hall during speeches by Bill and Hillary Clinton.

This was made easier by the DNC's decision to place all of the "Bernie states" at the back and upper tiers of the hall, instead of by alphabetical order, which is the usual plan. When you put people at the back of the bus, don't be surprised if they stage a boycott.

Sanders leaving the Democratic Party: According to multiple sources (WSJ and Fusion), Bernie Sanders will return to the Senate as an Independent. “I was elected as an Independent”, he said. My take is that he had achieved as much as he could within the Democratic Party; there are some good things in the platform, although no plan to implement any of them, the DNC is still taking contributions from lobbyists, there is a vague plan to maybe talk about reducing the clout of superdelegates, Hillary is conceding that she will, after all, vote for “some version” of the TPP, his people were denied a voice on the floor of the party that wants their votes, and he’s done.

The DNC had an opportunity to bring Bernistas into the "big tent", and it FAILED to do so. What the DNC had to do was to tolerate and allow dissent and a bit of chaos. Instead, it opted for a scripted and controlled coronation. This will send many more to the shelter of the Green Party. It's getting harder for me personally to justify my vote for HRC.

These unnecessary shenanigans undermine faith in our Democratic institutions, and makes impartial media coverage into a joke. I had to go to alternative media to find any coverage of these events.