Yes, there have been antinatalist demonstrations. For example, the group "Stop Having Kids" has organized outreach events in the U.S., aiming to normalize antinatalism and childfree lifestyles3. Additionally, a Reddit post highlights what was described as the first antinatalist demonstration in New York6. In Japan, there has also been an antinatalist protest, as discussed in a YouTube video8. These events are relatively rare compared to other social movements