  It is shown that a significant amount of detectable gravitational
microlensing events that could potentially be found by MAssively Parallel
Photometry (MAPP) projects (such as the MACHO, EROS and OGLE collaborations)
will occur for stars too dim to be easily noticed individually by these
projects. This is the result of a large magnification bias effect, a bias of
including high magnification events in any flux-limited sample. The probability
of detecting these events may be as high as 2.3 times the lensing probability
of stars currently being monitored by MAPP collaborations.
