Ska is simple, fun music that cares little for anything other than being fun, and is often gleefully immature.
Ska, as youngsters know it today, was reinvented by the 2-Tone movement in the UK (specifically Coventry) in the late 70s. The scene was overtly political and as @NuPNuA has stated was a deliberately multicultural movement, hence the name.
If you want to hear some original ska from Jamaica then have a look for songs by Prince Buster but beware you will find some historical attitudes.
Why does there even need to be a COP every year? They know what to do, they know what will be enough and they have the authority in their home nations to do it. COP is just theatre.