It'll be interesting to see if there's still any substantial interest on forums such as this by April next year. Personally I think their boat has sailed. I don't see what sort of income-generating role Harry is going to carve out over there, not at the level they require.
These are apparently the current movers and shakers in the US, as invited to the Obama's Dear Class of 2020 project:
Block 1: 3pm EST/12pm PST
Lizzo
Alicia Keys Message to Graduates
Justin Timberlake
The Simpsons
Liza Koshy
Shawn Mendes
President & Mrs. Obama Welcome
Taylor Swift
Billie Eilish
Beyoncé Knowles-Carter
FINNEAS & Co.
Michelle Obama
Block 2: 4pm EST/1pm PST (approximate timing)
Missy Elliott
Mr. Kate
Jimmy Kimmel
AsapSCIENCE
Alicia Keys
BTS Commencement
Colin Jost
Mark Rober
Sundar Pichai
John Green
Schitt’s Creek
Joseph Gordon-Levitt
Sec. Condoleezza Rice
Block 3: 5:18pm EST/2:18pm PST (approximate timing)
Jennifer Lopez
Malala
The Try Guys
Maluma
Jack Black
Sec. Robert M. Gates
Chris Pine
Jackie Aina
Dude Perfect
Block 4: 6pm EST/3pm PST (approximate timing)
Billy Porter
John Mulaney
Demi Lovato
Nikkie De Jager
Prajakta Koli
Seth Rogen
Heath & Zane
Lady Gaga
Chloe X Halle
President Barack Obama
Katy Perry
Block 5: 7pm EST/4pm PST (approximate timing)
Megan Thee Stallion
CNCO
BTS Performance