This is the second operational Crew Mission for NASA. Two astronauts from NASA, one from JAXA and one from ESA will travel to the ISS for a regular 6 month rotation.
Prelaunch news conference: Mission Update: NASA's SpaceX Crew-2 Launch
Crew 1 and 2 will be docked to the ISS at the same time for a period of 5 days (20 days supply is available if departure of Crew 1 is delayed).
Launch weather for crew mission is a little bit more finnicky than regular launches. The weather needs to be good along the whole launch trajectory. In case of an in-flight abort, crew needs to be rescued from the ocean.
NASA's Mars helicopter finally undertook its first flight. It managed to hover at around 3 meters off the ground and land again.
Anton Petrov: They Did It! NASA's Helicopter Actually Flew on Mars!
Ingenuity Helicopter: Wikipedia
The booster is a Falcon 9 on its second mission, carrying a payload mass of 13 t.
The rocket will launch from Kennedy Space Center (LC-39A), Florida and the first stage will land on a drone ship downrange.
Travel time to ISS will be 8:30 hours.
Check your local time of launch at: www.timeanddate.com
Where to watch:
Background information about previous SpaceX launches: Wikipedia
Useful links to stay up to date on launches:
Spaceflightnow.com: Launch Schedule
Everyday Astronaut: Prelaunch Previews
NASA Spaceflight nasaspacefight.com