"A LAN party is a gathering of people with computers or compatible
game consoles, between which they establish a local area network (LAN)
connection between the devices using a router or switch, primarily for
the purpose of playing multiplayer video games together.

The size of these networks may vary from small (two people), to very large
gatherings of a hundred or more. Small parties can form spontaneously
and take advantage of common household networking equipment, but
larger ones typically require more planning, equipment, and
preparation." - Wikipedia, LAN-Party