Catan, Cards against humanity, pandemic, Munchkin, Rumikub (could be played with two decks of cards, the tiles just make it flow better), Triominoes, Sorry/Aggravation (good with young ones). Talisman if you are really into Munchkin but want to take it seriously, and want to kill a whole day. Don't forget college games if you want to include drinking to excess! Beer pong, quarters, kings cup, minefield, etc. Just make sure to have people bring pillows and camp pads, lol.