There are a couple of times in the most recent event where the speaker claps his hands a couple of times. This still ends up with events very close in time and hard to suss out.

I just figured out how to determine the timing reasonably well. Record and monitor. Use a clapper as suggested, or even just clap hands. Clap repeatedly and adjust the time between claps until you hear the last clap exactly in time with the next clap. Once you've got that, it's easy to look at a time scale and get the timing.