Blacking up isn't necessarily connected with skin colour. There are many cultures where black skinned people 'white up'. It's just a disguise, usually using readily available materials. Apparently, Aborigines in Australia use ash. Caribbean dancers and mummers also white up. White skinned people have variously used soot, coal dust, burnt cork, etc.

It might be that the Padstow tradition is one of the few that is actually based on skin colour, but it seems that the participants have taken steps to minimise any offence and they should probably be left to enjoy their tradition.

Dianne Abbott needs to concentrate on real discrimination.

And she needs to learn something about her British culture.