There are several types of events where you would find a mix of amateur and professional musicians, or of scientists and science communicators. Some of them get paid for that appearance, others do not.
BooksScience CommunicationVisual artsWriting, images, and storytelling
Science zines and health zines
Science zines can be personal zines about health related topics, or small educational zines that explain a scientific topic. The Wellcome Collection recently opened the doors to their zine archive.