If you missed the event on Monday night, Tuesday you’ll get another chance at it. Even if slightly dimmer in luminance, the astronomical display will be visible that night one hour after sunset in the direction of southwest near the horizon.
The whole affair will only last a few hours, after which the moon and the two planetary “eyes” dip below the horizon. Even if you miss it again, it will still be partially visible for a few more days.
it will take more than 40 years for unpunctual stargazers to see this spectacle again. The two planets won’t meet the moon again so closely until November 2052. In March 2012 however, Venus and Jupiter will be seen together in a similarly bright show in March of 2012.