Boberfett,
I may not be an electrical engineer, but working theatre lighting, I know plenty about (not) blowing breakers. To figure out if you'd have enough juice, use the simple calculation of West Virginia (W VA), or Watts = Volts * Amperage. Convert that to Amperage = Watts / Volts and you've got how much amperage you'll use with the LAN party in full swing. Big tip though, ALWAYS be pessimistic about power requirements, use 110 for your voltage, try not to exceed 80% load on a breaker, etc. Keep those in mind and you hopefully won't have to call the electrician just as the party is about to get in full swing.