The first of the 2016 presidential election debates between Donald Trump and Hillary Clinton is tonight at 2am, (9pm Eastern) for 90 minutes. If you're willing to stay up until the wee hours, you can easily watch live.
Sky News: http://news.sky.com/watch-live
(Freeview 132 / Sky UK 501 or HD-516 / Freesat 202)
ABC live stream: http://abcnews.go.com/live
Bloomberg TV Twitter live coverage: http://debates.twitter.com
PBS via YouTube (embedded above):
PBS America (Sky 166 / Virgin 276 / Freesat 156) is also airing a Frontline special that profiles the two candidates, The Choice 2016. http://pbsamerica.co.uk/trump-vs-clinton
According to Variety, many other sites will also streaming the debate, Huffington Post, Politico, Buzzfeed News, Wall Street Journal, and Yahoo. It seems like you can't miss it. If you have a VR device, you can even watch NBC's 360 VR stream.
Will you be staying up to watch live or catch the next day's repeats?