My friends and I held an event called GNX: Gaming night extreme.
We used to have gaming nights, where we would either LAN, or people would bring over their TVs and we would all play different games. (This was before real multiplayer on consoles, so usually the best you'd get is 2 to a TV, hence the extra ones.)
Anyway, this gaming night extreme consisted of 12 dudes gaming for a straight week. There were naps and such, but there was always something being played at all times.
The numbers eventually dwindled to 5 people, and we capped it off with a marathon session of silent hill 1 and 2 back to back, which is double scary on massive sleep deprivation.