I cannot quite believe this, although I don't know why.
I don't think that you can both compel workers to attend an event as a condition of employment and then not pay them. Although I hardly think of myself as an expert in this field, I've won a couple of Fair Labor Standards Act suits in courts of appeals and I would love to take a shot at this one.
This should be a wake up call to the white working class. You're props and pawns in the great Republican/corporate game. Nothing more.