In book 5 Dolores Umbridge and the Inquisitorial Squad infuse a rather fascist element into the school. So I suppose the answer to your question is the Ministry of Magic.
Someone who takes over temporarily for the regular person
the vice president
Professor McGonagall takes the place of the Head of Hogwarts after the death of Dumbledore, however when Hogwarts is taken over by the Death Eaters, Severus Snape takes over as head and Minerva McGonagall resumes her old position as Deputy. *** Faerie0975: But then who is the deputy when Harry and Ginny's kids, and Ron and Hermione's kids, etc., go to Hogwarts??
All over Hogwarts and the grounds. The last part takes place in the Great Hall.
the vice president takes over until further notice
severus snape takes over as headmaster once harry leaves school to search for the horcruxes.
They took the Hogwarts Express from platform 9 and 3/4 at King's Cross station.
No. Harry does not run Hogwarts. McGongall serves as Head. Who took over after her is unknown.
at hogwarts
Hogwarts, which is somewhere in England
There isn't a bridge. You either cross over the lake in boats with Hagrid, or go along the driveway in cariages pulled by Thestrals.
The characters are from all over the UK. Many of them are from England but several are from Scotland, Wales and Ireland as well. Hogwarts takes students from all over the United Kingdom.