It is not currently possible using the tools currently available in tail sampling in the Otel Collector in Dec 2024.

This is because, you cannot filter out a specific NAME of a SPAN in a Trace.

Why? Because the match happens for ANY span in a Trace, ANY child span not named 'MyEvent' INSIDE the 'MyEvent' root level span/trace, WILL BE MATCHED. And this causes us to capture all traces again.