RE: Not sure where this belongs...
Well, if they are there, they are there. No reason why they shouldn't be out on any night when there is a lot of rain and the ground is really wet. You might try looking in some areas where there is bare ground like flower beds and gardens. You could also try getting worm food or coffee grounds and scattering it across a given area. That might concentrate them in a given area if there aren't too many of them.