Each tradition involving blackface should be dealt with individually. Whilst there is some evidence to suggest the element of disguise was important there is also in some cases a strong link to minstrels. Where the link is to minstrels the perpetrators need to have a rethink. Change is a big part of any tradition. Any tradition that is not prepared to change has become moribund.

Any tradition that contains elements that have lost their purpose should consider changing those elements if they might cause offence. Several people here have suggested using a more neutral colour if disguise is the only desired effect. I agree with them.