Where and How are the legendary characters during Rime of the Frostmaiden?

I’m DMing ROTF for players that have a very deep knowledge of the lore of the Forgotten Realms, it doesn’t bother me at all, but I would like at least to be prepared enough anyway to properly address the campaign theme. I’ve read "The Crystal Shard", and keep digging into wiki and other sources of lore, but there is still a lot of things that I don’t know for sure.

Massive spoiler for the Forgotten Realms books or some other campaign books.

About Bruenor, Catti-Brie & Regis:

About Drizzt:

About the Dwarf, and more specifically the Battlehammer clan?

Overall do you have any advice on how to proceed with lore accuracy in the campaign, and some sources of lore I could read in preparation