Banned flags is false.
Ordinance relates to bringing things that could be weapons to protests.
Cant bring a huge flag on a wooden stick but can carry flag.
Code of ordinances
not quite on point but...
SCOTUS already ruled that LEO can stop you for a violation of a law that doesn’t exist.
https://www.mintpressnews.com/court-rules-police-dont-need-know-laws-enforce/217236/