so the upfronts start at 9pm U.K. time? please say yes bcos I’ll be working all day long and it’d suck to have a meltdown near my boss

Yes, anon! You’ll be in peace at home!
According to Variety, it starts at 4pm Est, so 9pm UK time.
But don’t forget nothing and no one has ever confirmed they’ll attend. It’s just a guessing and wish at this point.

http://variety.com/2017/scene/news/upfronts-2017-schedule-tv-networks-events-parties-1202395460/