This is an invitation from the Matthew Davis Cancer Research Foundation, inviting Zhang Zian to San Francisco to attend the foundation's 20th-anniversary celebration.
The Foundation also invited him to tell Kathy's story to more people at the ceremony.
Of course, as a foundation, obviously, it considered his status as a Chinese. Inviting him to attend can show the foundation's growing influence and the determination of people around the world to join forces to fight cancer.
On the one hand, Zhang Zian felt that this honor should be attributed to Kathy, and he did not feel right leeching off her. On the other hand, he also hoped that more people could hear Kathy's story.