They are going a sweets shop, and... No.
They are fighting in the same place where Aizen fought Gotei 13. The town has been replaced this time as well.
Kenpachi BEFORE his power up with Unohana. Feats before that only.
None of do anything they haven't done before. (Kenpachi doesn't suddenly go ban kai and destroy the world. Not allowed)
Feats from both Anime and Manga are allowed. fillers included. No movies though.
Kisuke is prepared to kill kenpachi, same the other way round. otherwise it's in character.
Urahara does not have prep.