It's the 2nd-closest conjunction of planets for all of 2018. Venus is bright and low in the west after sunset. Uranus is up there, but too faint to be seen with the eye.
When Mars is at western quadrature in Earth's sky, Earth is at or near a greatest elongation - greatest distance from the sun on the sky's dome - as seen from Mars.
On March 18, the young moon will be tough to spot from Asia or the Southern Hemisphere, but the rest of the world has a shot at it. On March 19 and 20, we should all see the young moon.