The May 27 event, organized by the UK Beijing Association, the UK Society of Chinese Lawyers, and the Roundtable of Southern California Chinese-American Organizations, featured keynote speakers — including Zhu — who encouraged people to take positive action against racism and discrimination, such as reporting incidents to authorities and taking legal recourse.
I am doubt whether this sentence is complete. The subject is "the May 27 event", and it is "organized by the UK Beijing Association, the UK Society of Chinese Lawyers, and the Roundtable of Southern California Chinese-American Organizations" which is non-finite verb, I guessed "featured keynote speakers" is the predicate. But my intuition told me that it needed add something at the end of the sentence.