Bleeps and DVCsmile... They are scheduled for filming the Christmas Parade December 2, 3, and 4 (as a back up day). The bulk of the actual parade filming at MK is on the 3rd. Bleeps it WILL take over Main Street, but not the rest of the park. Generally the filming begins very early in the AM (before the park opens) and wraps up in the early evening... last year the afternoon parade was pushed back to 5pm because of filming delays) If you take the train (or weave through the crowd on Main Street) you will find the rest of the park to be average. They only film on Main Street from the castle hub to Town Square. Basically what they do is they bring one float out at a time, they will film it coming down Main Street, full music, dancers, etc (whatever is associated with that float). They will film it over and over again, backing it up and brining it forward as many times as they need until they get the shots that they want. Then that float will leave and a new one will be brought out a few minuted later. It is a long, tideous process that takes much of the day. The "crowd" that is there is mostly extras that are there for the long haul (not something you want to subject small kids to, can be boring). But again, the congestion and mayhem is only on Main Street. Those that have been in the park on filming day in previous years have reported that the rest of the park is usually fairly empty (I work on the trains, so I don't see much of the interior park crowd to confirm that).
Kpulle: The Trolley show (which will not be running during parade filming) is really cute. They use the trolley (or the Omni Bus if they are working on the Trolley tracks). They stop 3 or 4 times along Main Street, starting in the Hub by Casey's Corner and working there way back to the train station. They do a song and dance welcoming you to Main Street USA (catchy little tune). The shows are generally presented daily at 9:25, 10:20, 11:20AM and 12:05PM. It's cute if you get a chance to see it.