Since it is being held in a public place you should have quieter games so as not to disturb other patrons. I would suggest that you have everyone form other words from Christmas Party and words related to your company such as Electronics or computers if that is what you sell. The winner(s) can get a silly prize. Provide paper and written instructions. I personally prefer a party where everyone mingles rather than being forced to play games. Are you sure that everyone wants to play games rather than just enjoy the season?
a great mingling game…get a bunch of small christmas bells. Tie each on a single red string (long enough to ware as a necklace)
Now here’s the game: every person wares a bell around their neck, BUT are not allowed to cross their legs or arms. If caught they must give up their bell or bells to the person who caught them crossing their legs or arms.
Whoever gets the most bells wins. AND Yes a person who’s bell is taken can still in turn catch someone else and take their bell or bells. Great fun !