Moon, Mercury, and Venus
On Monday, the crescent MOON and the planets VENUS and MERCURY will be very close together in the western sky immediately after sunset (screenshot from Stellarium). Venus is the bright object to the right of the crescent moon, and Mercury is above and to the left of Venus. On Tuesday, the moon will be farther to the left of the pair of planets, but they will still make a nice trio.
Because it is the closest planet to the sun, Mercury is hard to spot. This June, Mercury is making its best evening appearance of the year; it doesn’t set until about 90 minutes after the sun. Even so, you will need a clear western horizon to see it. Luckily, this week, Venus and the moon will help you find it.