Siem Reap has a community of old-school gamers who are into LAN parties. You can find like-minded individuals who share your passion for classic games like Quake 1,2,3, Call of Duties, War3, and Starcraft.
There's an old-ass gamer from the days of Pong and text adventures who is in Siem Reap and would be a great person to connect with for a LAN party.