>>dbsmit+(OP)
Does it matter if it's planned? If you have a medical condition and you need to get to a hospital it doesn't matter whether you had a week's notice or a days notice because the need to get to a hospital is unplanned.
>>JamesB+pb
Yes it matters that it's planned. There are permits, detours, announcements and emergency response planning for all of the above. Here's the process for getting a parade permit in NYC