They're moving it to a museum, so the question of where is a museum. As for why, presumably because they want to keep it.
The defense of the statue that keeps popping up is that slavery was far from the most important thing about the man. That he was a successful merchant and a philantropist, and was important for Bristol for these reasons. His involvement in the slave trade is excused as a historic artefact. This is the exact opposite of what you want to achieve by having statues of slavers in the city centre. They don't want thoughts and discussions about slavery and the Royal African Company. That's not what he's about, that's judging someone by today's morals (which is a very annoying saying, being involved in the slave trade is worse than being pro slavery generally or just apathetic to it, and plenty of people managed to be against slavery as well. Even going further back, Aristotle was way more misogynistic that Plato, his teacher, and more racist than Socrates, so of course we can judge him on that). That's snowflake business. If the statue is invoking those thoughts and discussions it's wholly incidental and not intended, and it's provoked by the very snowflakes who tore it down. Without people tearing it down you wouldn't have learned anything from the statue. We had a local issue over here, someone wanted to remove a thing (not a statue) dedicated to some guy who was pretty damn racist. They didn't remove it, but put up a plaque. No one reads the plaque, and no one has talked about it since. Having it there is better than not having it there, I guess, and having the thing there is fine as well, but it's not generating thoughts or discussions. I'm not saying that we should remove or move every statue of shit people from the past, but I'm extremely skeptical of them being thought promoting in any substantial way.
As for the concert, pretty sure you can find similar atmospheres today. Not Nas quality, maybe, because only Nas is Nas. If you put Kendrick Lamar in a small, packed venue like that it'd be pretty crazy as well with the right audience. I've been to some absolutely bonkers concerts even by local groups who to be honest are a bit shit. Some violence shouldn't be underrated either, within limits.
By the way, if you tag someone in an edit they don't get the notification. It's a bit annoying, but it's a tech limitation.