As always, thanks for the effort.
Golf With Your Friends
I watched a good amount of this on Funhaus and yeah, it's mini-golf not missiles and lasers and death, and yet it looks really fun. Thanks for reminding me of this, if all else fails I will suggest we try this. Bit low key for a LAN party but again, it looked like a lot of fun.
4x
Civ 4 and Total Warhammer 2 are both on the table. Big commitment though, you're basically like "ok we're playing this for 3 days then." I'd put games like Terraria or your garden variety crafting/survival games into this category as well.
aRPGs
Diablo 2 might actually be on the table. At this point I think I'd be happy just to bro around in D2. PoE does not sit well with enough people at the LAN party to recommend. (Too bad I've put hella hours into that game.) Torchlight is a meh from me, personally.
Risk of Rain
Seen it around plenty, never thought of playing it. Modding in more people for coop action would be great if it's a low barrier to entry.
RTS
A few of my friends seem to be in to competitive RTS at the LAN. Personally, playing against my friends has never been my cup of tea. If we wanted to go that route there's many options but I try to steer the group away from it. One dude's idea was literally "let's all play against the dude with the highest APM in Starcraft" which got a big no from me. Personally for RTS, I'd recommend for us to play Dawn of War with all the mods or Company of Heroes, but I get that for many playing against OP AI isn't really a draw.
This kind of encompasses all the old time arena shooters as well. Mindlessly running around shooting rockets at each other for hours just doesn't do it for me, personally. Similarly, I have games like Gang Beasts that don't really work or last for the same reasons.
There's definitely multiple breeds of LAN players: some want to tangle with people or friends online, and some want to just play coop in the live company of friends. I'm definitely in the latter group.
Running With Rifles
See, I'm familiar with RWR and I legitimately tried to get people to buy in last time, to no avail. I guess the videos on Steam didn't inspire them. But it was also late in the LAN party when people were close to tapped out, so I can try again.
Wargame: Red Dragon
I have one of these and after like 45 mins trying to figure it out going in blind, I noped out. Learning threshold is important for a LAN, IMO. If it's too complex or detailed, many people nope out immediately when they see it.
Most of this is just a desperate attempt for me to avoid having to play League of Legends with them.