You’d have to cache an available copy, wait for updated data, and then compare the two, to produce a diff. I’d imagine (or hope) there’s a process behind the scenes that slows down and selectively fragments the availability of new data, so that such diffs are too coarse to be revealing. Annual updates, staggered by decoupled groupings, being an ideal strategy.

In general though, just knowing that an event has ever occurred thanks to the map, circadian rhythms often take care of the rest, since it’s a map of (mostly recreational) human activity.