If you like parades, costumes, and BIG floats, this is well worth watching.
URL for the live stream for the parades in Rio:
Here's a page with a schedule:
You need to look through all the groups, as different groups have different days. And yes, most of the parades begin at night and go into the early morning hours. Its summer there!
Note that times are Rio times. Rio is six hours ahead of Seattle. The streaming starts 15-30 minutes after parade schedule. The final parade is February 17, 2018.