I'd disagree. In fact, these black history months and pride parade months and Juneteenths are perfect for waking people up to all the nonsense. Everything relevant in history books since the antiquity has been white history, and everybody knows it.

Better off to make it year round. There's numerous holidays and other non-holidays that are notable. Learn the history and context of them, and then market them explicitly. For most Euromutts in US and Canada, you can have quite the selection to draw from.

https://en.wikipedia.org/wiki/Calendar_of_saints

https://en.wikipedia.org/wiki/Athenian_festivals

https://en.wikipedia.org/wiki/Roman_festivals

https://en.wikipedia.org/wiki/Katholikentag

https://en.wikipedia.org/wiki/Category:Christian_festivals

https://en.wikipedia.org/wiki/Norse_rituals

https://en.wikipedia.org/wiki/List_of_festivals_in_Europe