Found on Android Central - https://www.androidcentral.com/stream-free-live-tv-every-nig…
- Free between 5PM EST - Midnight(US TIME) 7am-Midday(Melbourne)
- VPN Required
- No CC Required on signup
Promotion does not have an end date that i could find
Sling TV is offering a new way to spend your nights at home and you won't have to pay a cent for it. The all-new 'Happy Hour Across America' promotion unlocks access to Sling's live TV streaming service for free between the hours of 5 p.m. EST and midnight, letting you watch over 50 live channels as well as all the on-demand content you
want; it even includes free cloud DVR service, and the best part is that no credit card or billing information is needed to start watching.
To start streaming during Sling TV's Happy Hour, you'll just need to create an account at Sling which only takes a minute or two to accomplish. Once you have an account, you'll be able to log into Sling on any device that supports the Sling TV app, such as streaming media players, smartphones, tablets, or your smart TV. Your account allows for streaming on up to three devices all at once, so your kids can watch on their phone or tablet as well.
The Happy Hour promotion gives you free access to the Sling Blue plan between 5 p.m. EST and midnight. This plan features some of the most popular news and entertainment channels, including A&E, AMC, Bravo, E!, FX, HGTV, Nick Jr., TLC and more.
Confirming this works - thanks to the OP
Watching Trump's friends on CNN now.
Greetings from er Long Island :)