Macy's Thanksgiving Day Parade

The good thing about high-priced Liberty Harbor (a parking lot campground with W&E hookups plus security, bathrooms/showers and a dump station) is the very short walk to Path train taking you fast to Manhattan with connections to the subway system. (Weekdays you can also use ferries to Wall Street but doubtful they'd operate on holidays.)

So if you like crowds, you could do it fairly easily via public transportation. The Path schedules are available online.