Conversation so far:
What public service did Joe Walsh involve himself in?
Walsh's love of Santa Cruz Island grew into a lifelong commitment to conserve the environment there. He is President of the Santa Cruz Island Foundation
When did Joe Walsh start advocating to conserve the environment in santa cruz island?
In 1980
Are there any other interesting aspects about the Joe Walsh  article?
Joe Walsh is active in charity work and has performed in a number of concerts to raise money for charitable causes
Did Joe walsh work with anyone of note within these charities?
Zac Brown Band, Gary Clark Jr., Keith Urban
Why did Joe Walsh contact Zac Brown Band, Gary Clark Jr., Keith Urban?
to try to organize and perform what became VetsAid
Did Zac Brown Band, Gary Clark Jr., Keith Urban  agree to perform in Joe Walsh's vetsaid?
The inaugural VetsAid took place on September 20, 2017 featuring performances by Joe Walsh, Zac Brown Band, Keith Urban and Gary Clark Jr.
How much if any did the Vetsaid concert by Joe Walsh charity collect?
nearly $1.2 million in grants

Question: What was his most beneficial charity?
Self-contained rewrite: What was Joe Walsh's most beneficial charity?