Starlord visited some sick kids last year as well.
https://www.yahoo.com/movies/chris-pratt-proves-to-be-a-real-life-superhero-during-95389292982.html?src=rss
I bet he gets asked why Rocket and Groot didn't come along with him!
I do recall Mark Hamill talking about visiting sick kids back in the 80's, but he probably never did it dressed as Luke!