Minecraft: LAN options

My team and I are hosting a LAN-party this friday and we expect about 20 people to enter our Minecraft: Hunger Games contest.
The problem is that we have no firewall or router access, and all attendees will be on the same school network.
What is our best option for server setup? Do we rent one? Running the bukkit from my computer is impossible, I need to port forward to let people on the server. If I open my games to LAN, no one can connect because of firewall configuration.
Thanks in advance
Best Answer
If everyone is on the same LAN, you do not need to port forward in order to play.
You need to do two things:
First, find your local IP. For Windows, start CMD as administrator, type in ipconfig and press enter. Next to IPv4 Address should be something that looks like 192.168.1.X where X is one ore more numbers. Remember this number, with the dots.
Next, start up your server.
Finally, have people connect to the IP you found earlier, 192.168.1.X.
Have fun!
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Quick Answer about "Minecraft: LAN options"
- Choose a host computer. ...
- Launch the game and click Single Player.
- Create a new world or open an existing one.
- Inside that world, press the Esc key, and click Open to LAN.
- Choose a game mode to set for the other players.
How do you get LAN to work on Minecraft?
[SOLVED] Minecraft LAN Not WorkingCan you play multiplayer Minecraft on LAN?
Start a LAN game Click the pen icon to create a new world or edit a current world. Go to Multiplayer and make sure that Visible to LAN Players is enabled. Choose Create or Play to start the world.Does LAN work for long distance Minecraft?
Yes! There is a way to do this. However it is slightly complicated. Even though most people think that LAN worlds only work on the same internet connection, it is possible to get someone farther away to connect.Can you op in LAN?
the /op command is only available in a multiplayer session hosted by a server running the multiplayer server jar (and that goes for the ops. txt file too). It is not available in a single player world that has been "opened to LAN" (though it would be nice if Mojang did add feature parity here).*UPDATED* [1.18] How To Join a Minecraft LAN Server With Friends (Windows and Mac)
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Answer 2
Back in the day when I didn't know the first thing about networking the only way I found to make certain games work in lan was using hamachi (https://secure.logmein.com/products/hamachi/download.aspx).
It easily sets up a vpn so you can pretend that everyone in it is in a LAN, but unfortunately it means you need all 20 of your guests to install it, unless you can do that yourself before they arrive. I usually avoid it when possible but it seems like a good option when you have absolutely no access to any configs at all. Oh and it's not really local, so you should test how well it works with 20 players in it. I think there should be no problems, but I've never tried it with more than a handful and you don't want to leave it up to chance, it's better to pay for a server rather than having lag.
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Images: Andrew Neel, Gustavo Fring, Pixabay, Andrew Neel