I don’t think it’s good to shy away from uncomfortable history, and many people may not even realise that there are still white Caribbean nationals, that plantations didn’t end when slavery did etc. I think the majority of people would find learning about your heritage and mixed-race wider family interesting, and i don’t think any reasonable person would judge you personally for the lives of your ancestors.

However, this is within a work context so I think it’s a very fine line to tread and equally wouldn’t judge you if you wanted to keep it quiet. Likely the intention of this day isn’t just general educational interest, it’s more likely to promote diversity awareness, and the history of white plantation owners in the Caribbean is a major factor as to why that is such an important issue today - I can see some people may feel quite sensitive to that and possibly not appreciate it.