The event was a benefit for ALS One. https://alsone.org
Blurb on their site:
"ALS ONE is an unprecedented partnership of world leaders in Amyotrophic Lateral Sclerosis (ALS) research and care who have joined forces to expedite research towards a cure while helping all individuals who are living with the disease now."
Nancy met someone at a zoom event a few years ago and they became friends. Her name is Michelle Strojny, and she is living with ALS. Nancy organized this event in honor of her friend to support research for treatment for ALS.
(The fictional character Gregory on GH also has ALS).
Website explaining the event:
https://www.classy.org/event/daytime-unites-to-help-end-als/e545685
Edit to add: screengrab image of Michelle Strojny from the invitation video,
saying she'll be there, and telling of the band that will be playing at the event, and she points out that this happens on May 4th so she said "May the Fourth be with you". (Star Trek reference)