Is there a way to get a list of all parties and their representatives who participated in this event?

Ok, so politicians that sow polarization by complaining about DEI is bad?

The only people you mention “abusing” what you call the “well-meaning intentions” of “DEI” are:

a growing population of poor whites

As they are, as implied by your formulation, misinterpreting the policies as favoritism. It this what you meant with abuse?