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The municipalities aren't really involved in these (except for permits), let alone would announce them unless they are large and a local TV station steps in too,

The start times will vary as some locales will have a "march" (often in the morning) as part of the event, where they process to some nearby location, and then there will be speakers who will address the attendees. Other locales may have people showing up at a central location (government-related building or park nearby) and/or will line up along a main thoroughfare with signs in support of the event.