Just found this conversation. Yes, games like League of Legends and DOTA 2 have really high learning curves. For those types of games, the attendees of these events would definitely want previous experience. If that's the intention of a LAN party, go for it. Super Smash Bros. Brawl, Mario Party, Madden, FIFA, etc. are easier games to have as they can be played with no experience (not saying that a new player would be good; they just won't ruin an online multiplayer game like LoL or DOTA).
For a first-time event, I would stick with the second list of games and then consider adding LoL or DOTA. Keep in mind that a gathering with the second list will naturally be shorter because of the average game length. LoL or DOTA range from 20 to 50+ minutes (at least League); SSBB is about five minutes.
Hopefully this helps!
