The "Baquet pep rally" refers to the (now infamous) NYT Town Hall where the chief editor, Dean Baquet, explained to journalists how they were going to be beating the issues of race and racism to death for the foreseeable future.
Apparently 1619 gets quite a bit of play in American textbooks as "the year slavery began in the colonies" (despite this being woefully untrue; see the Smithsonian article above), and 400 years exactly is a big, round number, hence I can fathom the argument that 2019 would be a logical year to commemorate "the start of slavery". Timing issues aside, we're not talking about a simple commemoration, and no, you most certainly didn't do bigger things on your 25th anniversary.
In the Times' own words, these specials kick off
The 1619 Project, a "major initiative" (ibid.) that "aims to reframe the country's history" (ibid.). They're giving away copies of this week's first edition, called "The Slavery Edition", gratis.
You may believe they're concerned citizens who really, really care about the centenary of a slave ship sailing into Virginia, and perhaps you're right, but I'll believe this if and when the Times' "major initiative" doesn't turn into a months-long crapstorm stirring up animosity (particularly animosity towards your president). I don't trust them as far as I can throw them when it comes to objective journalism. One also wonders why a newspaper, of all businesses, is undertaking a major project to "reframe the country's history". Perhaps they should rename themselves to the New York Historical Revision Society.