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CREW-4 WELCOME CEREMONY ON ISS, Apr 28, 2022, Earth orbit, 2:40 am ET
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The launch of Crew-4 has been delayed several times. As of April 25, it is scheduled for April 27 at 3:52 am ET, with docking later that day at 8:15 pm ET and hatch opening at 9:45 pm ET.
However, NASA will not hold the welcome ceremony for several hours thereafter, on April 28 at 2:40 am ET.
The full schedule of pre-launch, launch and docking activities as of April 25 is in NASA’s press release. It does not explictly say this ceremony will be covered live on NASA TV, but all the other events will be.