Recently, the UC Berkeley physics department received $35,000 from an anonymous donor to create the Sushant Singh Rajput Memorial Fund in Physics. SSR was a National Physics Olympiad winner and was passionate about astrophysics as well. UC Berkeley is known for its astrophysics graduate program and the fund will help support campus graduate students studying astrophysics.
In my opinion, spreading education, enabling someone to study further could be the best tribute to anyone's memory. Listen in to why I think so!