  Estimating the number of microlensing events observed in different parts of
the Galactic bulge is a crucial point in planning microlensing experiments.
Reliable estimates are especially important if observing resources are scarce,
as is the case for space missions: K2, WFIRST, and Euclid. Here we show that
the number of detected events can be reliably estimated based on statistics of
stars observed in targeted fields. The statistics can be estimated relatively
easily, which makes presented method suitable for planning future microlensing
experiments.
