what's the difference between BHM and say... a TV channel showing programmes related to a particular theme for a certain period of time (e.g. Christmas)?
edit: I'll just leave this here
I ask this because unless I have completely misunderstood the nature or True Meaning™ of Black History Month - and please educate me if this is the case - I don't really see a problem? It's just a period of a month in which events are used to raise awareness of black history, just like Prostate Cancer Awareness Month might be used to teach more people (i.e. raise awareness) about the disease, or BBC Three's disability season (a recent-ish example) might be used to teach people about the challenges that people with different disabilities face.
I'm not sure how talking about what black people in the past did causes or perpetuates racism either... making it easier for people to learn about it is certainly better than it being completely forgotten, just as with the history of any person or group of people.