The EarthSky organization says: Before dawn on Tuesday, May 23, 2017, look very low in the east – very shortly before sunrise – for the extremely thin waning crescent moon and elusive planet Mercury. The moon will sweep 1.6 degrees south of Mercury this month; that’s about three moon diameters. Still, if you manage to catch them, they will be beautiful in the dawn light.
If you look eastward before dawn, you’ll easily notice a bright object. That’ll be Venus, which is due to shine in our dawn sky for most of the rest of 2017.