Who was present at Anne’s execution? Was she executed within tower walls or outside? would common people have been allowed to watch?

See my article at http://www.theanneboleynfiles.com/7228/anne-boleyns-execution-site/7228/ for a full explanation of where Anne Boleyn was executed. She was executed on a scaffold located between the White Tower and the present day Waterloo Barracks, where the Crown Jewels are on display. It was a private execution and Kingston was ordered to empty the Tower of foreigners, probably so that they could not write sympathetic accounts and spread them around Europe.