Distribution of host star (lens) magnitudes from a sample of simulated planetary microlensing events injected in the Euclid image. The gray histogram shows the W149 (left) and VIS (right) magnitude distribution of all hosts in a sample of 1691 planetary microlensing events drawn from simulations presented in Penny et al. (2019), and the black histogram shows the distribution of 432 events brighter than W149 < 22.5, which were injected into our simulated image. The red histogram shows the distribution of magnitudes for the sources of the 432 events with bright lenses.