A globular cluster is a spherical collection of stars orbiting in the halo of spiral galaxies. Our own Milky Way galaxy has over 150 globular clusters.
A conjunction is when 2 objects share the same right ascension. The Jupiter-Mercury conjunction on August 15 is the next one. Look for them before sunrise.
The Perseid meteor shower peaks this week! It's best between midnight and dawn. The peak is August 12 and 13 before dawn, but watch around those mornings, too.