TG (The Gathering) is the world's largest LAN party. It is arranged in Hamar, Norway every easter, and lasts for 5 days and nights.
At TG, you'll find more than 5000 participants, who stay there for the entire party. That means it is not comparable to the Expos, as people do come and go from those. TG is also featuring the world's largest temporary LAN.
The competitions range from the usual scene compos (demo, anim, graphics, music and html), via game compos (Quake 3, Half-Life Counterstrike, StarCraft) to wild compos (floppy disk throwing, hard disk throwing, zagging and so on).
Visit gathering.org for more details.