Print out a chart (or will you have access to a computer in the clubhouse during the celebrations?) so that people can find out what their Chinese horoscope animal is.
Are you anywhere near a 'China town'? They'll usually have shops that sell lanterns and things.
Also, Chinese usually put poster thingies by their doors. I can't remember what they are supposed to be for. I think they are either supposed to bring good luck, or ward off bad luck, I can't remember which.
If you can get some red paper, you could get people to make paper cuts, which is a traditional Chinese craft. Check out these images:
http://images.google.com.qa/images?hl=en...cuts&gbv=2
A lot of Chinese paper cuts are fairly intricate and complex, but you could try to make them simple. Maybe people can make a paper cut of their Chinese horoscope animal sign? Try Googling for some ideas and pictures for that. There are twelve animal signs.
For children, there is also a traditional of giving 'hong bao' (pronounced hong - bow, bow like take a bow, bow down...) -- a red envelope -- with some money inside. Chinese are quite superstitious generally speaking. They don't like the number four because "Si" = 4 in Chinese and that sounds a bit like "death". So don't put multiples of four in the envelope. However, Eight = "Ba" and that sounds like "luck" or "prosperity" or something like that (I forget which, Google if you want to double check), and also the number nine = "jiao" (jow rhymes with bow, as in take a bow, bow down) means something like longevity (again, double check via Google) so Chinese think the numbers 8 and 9 are auspicious numbers, so they will give children hong bao/red envelope with money with multiples of eight.
Obviously relatives might give a lot of money to their children, but just for novelty purposes, you could put 8 pennies or 9 pennies (or 8 x 10p = 80p or 9 x 10p = 90p) or whatever in some red envelopes and explain to them the significance of 8 and 9 (good) and 4 (bad) in Chinese superstitious terms. If you live near a China Town, you should be able to find a store that sells hong bao/red envelopes.
Oh, they also give... erm... let me check... I think it's mandarin oranges or peaches or something, because that 'sounds lucky' too... I'll get back to you...