You also have to be more careful in crowds or at events. At conventions, people tend to be respectful towards an elaborate costume because it is viewed like art. They ask permission to touch props or take photos and give a bit of space if the person is trying to walk around.

On Halloween, that is gone. People are significantly more likely to run into you, touch you/your props with sticky hands, or be intentionally rough "as a prank." Stepping down to simpler costumes is a must.