the statement says "that calls on all three organisations to eliminate the use of full-face black or skin tone makeup. Your committee fully supports this call."

That's not ANY colours, Snuffy. Full face blue and green would be fine, as far as I can see. I think it is an attempt to deal with blackface and at the same time cover Indian, Chinese etc etc.   I take the earlier point that if a dancer is black or Asian and wants to use the sort of make up they use every day then that should not be prohibited.

It is not a law, it is the membership rule of an organisation. So I don't see any real grounds for a legal challenge, unless you choose to make the case that being prohibited from blacking up infringes a legal right, and that sounds a tough legal case to make.