The big blue planet will be at its closest approach to the Earth, it's face fully illuminated by the Sun. This is the best time to view or photograph Neptune, though you'll need a fairly powerful telescope to resolve major details.
The Perseids are always a spectacular show, with up to 60 meteors an hour visible at its peak. Look to the constellation Perseus under dark skies, and you'll be guaranteed an awesome show.
Look to the east after midnight and you should be able to see 20 meteors per hour in the constellation Aquarius. The moon may hang around for the show, hiding some of the fainter meteors. Though the shower lasts for nearly a month, the best time to view the Southern Delta Aquarids is at their peak on July 28 & 29.
This is the first day of summer in the northern hemisphere, and the first day of winter in the southern hemisphere. The Sun will have reached its northernmost position in the sky, with the north pole tilting towards the sun.
Look to the east after midnight, under dark skies, and you should be able to catch this light meteor shower. At its peak, May 5 & 6, you should be able to catch 10 per hour out of the constellation Aquarius.
The Sun will shine directly on the Earth's equator, casting both north and south hemispheres in equal day and night. It's the first day of spring in the north and the first day of fall in the south.