In the previous century i visited many lan parties with my absolute beast of a pc case (an old Siemens 4U 19" metal monster where i stuffed an Amd Athlon setup in with a bunch of harddrives) that i got for free from somewhere. Then carried the huge CRT screen and placed it on top of it. It was insane, i was young (and insane), but i got it all dirt cheap. Most people loved it. And even back then repurposing discarded or super cheap hardware for as long as possible for as many functions as possible gave me much joy and saved me a great bunch of money.

If i had to do a "lan party" these days i'd just connect my Steam Deck to some hdmi beamer and play Jackbox games with a bunch of people.