Biden can’t get dumped before the convention because Dean Phillips is the only one challenging him. The democrat party just can’t dump him during the primaries - they’re not allowed to just declare someone else the nominee unless Biden accepts the nomination and then vacates it at the convention or after the convention. Because of this, Biden’s replacement will be after the convention.
Yep. Just like they did for Hubert Humphrey in '68, it'll be Gavin Newsom in '24.
And both conventions were in Chicago, FWIW.