YouTube will stream the Royal wedding live on Saturday
https://www.cnet.com/news/royal-wedding-youtube-livestream-prince-harry-meghan-markle-saturday/
The question is not really where will you be able to watch the Royal wedding on Saturday, but more like where won't you be able to watch it.
As well as showing on pretty much every TV channel and every news site on the internet, you'll also be able to stream the nuptials of Prince Harry and Meghan Markle live on YouTube. Viewers around the world will be able to watch the live stream on the Royal Family's YouTube channel, starting at 12 noon UK time -- that's 7 a.m. ET or 4 a.m. PT.