On the event page someone linked to Darnell L. Moore's piece Post-Whiteness, which is about why the entire idea of post-whiteness is a busted concept. I think this quote from the second-to-last paragraph explains why this is an important topic for our community to think about:
Whiteness travels in stealth; it is supplemented by what anti-racist feminist Peggy McIntosh, writing on White privilege, unforgettably names the "invisible knapsack." The fact is: that "knapsack" has been quite visible in the lives of native and non-white Americans. It has only been invisible to those who carry the weightless knapsack on their backs. Indeed, the burden of the sack is felt by everyone but the bearer.