I don't see any value in notifying police about how you are going to violate the law. If you want to get around the ordinance, you should probably seek some kind of permit, exception, waiver or other blessing from the City Council.
You can reach our offices directly at (515) 288-6041. The comments listed here are of a general nature and should not be understood to create a formal attorney-client relationship -- that is, I am not, and I cannot give you legal advice here. I am licensed in Iowa and to become your attorney, I need to understand the particular facts and circumstances of your legal question.