Do they broadcast the parade?

No

Special events

not live...only guests videos on youtubr

Check YouTube

They do for special events and holidays. YouTube has hundreds of videos from vloggers daily. Just search for Disney parades and you will see many videos as well as live broadcasts.

Only on holidays, now they have short bursts of floats to keep things moving more.

As in for web streaming? I don't think so

Yes they do.

Only on the holidays

Yes

Only when it is about to start