On June 14, we celebrated at MPIP the life of Kai Zhang who passed away untimely on May 24, 2023. Supervisors, former PhD students, collegues, and friends shared memories and impressively demonstrated the influence that Kai's research had and still has on their own research. Thanks to Peter Skabara, Long Chen, Wenxin Wei, Run Li, Martijn Zwijnenburg, Alexander Kühne, Rob Dawson, Paul Blom and Yan Zhao for their great talks, thanks to Calum Ferguson for co-organization. We are glad that Kai's mom and cousin and many friends could be present. It was an emotional day. Kai will never be forgotten.