Something we do where there are people from different circles i.e family, work, friends or if the age groups are a big range is Autograph bingo" or you could just call it a quiz. Basically print enough sheets for everyone, and they can decide to play or not or team up, You need as many questions as you want 10,20 etc starting with find smeone who... you then (knowing all your invited quests) choose statements that you know someone will definately be able to answer and sign to prove it, e.g Has seen Man Utd play more than once, knows the name of the teletubbies, can name 5 Beatles songs. It always goes down well as it comes across as spur of the moment, and if no-one is interested its no big deal or failure (thats never happened mind) And it gets people warmed up and mingling. Have a great party and good luck for your Best New Year ever.