The picket at Independence Hall was a yearly event called the Annual Reminder. It took place every July 4 from 1965 to 1969. The Stonewall riots began June 28, earlier in the summer than the Annual Reminder.
The goof item below may give away important plot points.
Every other person handcuffed during the Stonewall raid is cuffed with their hands behind them. Bostonia's hands are cuffed in front of her because if they were cuffed behind her she wouldn't be able to throw the first punch.