In dot memory 2017.3.2, once you take a snapshot and open the snapshot for further analysis, you have a section for "Event handler leak.".
https://www.jetbrains.com/help/dotmemory/Inspections.html?Wave=11#event_handlers_leak --> explains how it works.
I have created a sample application which results event handler leaks. I took a snapshot of that application with the event handler leak. But DotMemory is not showing the event handler leak. I have attached the sample project along with this post.