Well that's fine, you could track the future events occurring around these people. At the same time you don't need to consider the significance of the events for the person, just whether or not it's surprising that they happen.I'm not sure that it is events which are disposed to synchronicity. I think it is some people. Also, since the significance of these events to those people cannot be objectively assessed, it can't be objectively evaluated by science.
I like the universe and it does appear to throw some wonderful curve balls at me from time to time. Just not enough for me to think that it is paying any more attention to me than to that half eaten banana on my desk, which may, in a marvellous display of synchronicity, meet with other bananas from the same bunch in my stomach later today.As far as counting the hits and ignoring the misses goes, that would be a standard skeptical response. I have no way of demonstrating to you that this is not the case. The only way you could ever be convinced of the existence of synchronicity was to experience something yourself which you yourself could not put down to mere co-incidence. I have no way of knowing what it would take in your case, but where-ever you draw the line it is possible the Universe could throw something at you which crossed it.
This is why I was suggesting that it might be possible to count the misses as a way to see if there is anything going on.