Many work groups like government and private offices come up with a certain sports fest annually. It is a way to get some air especially when the environment is very stressful with quota that should be reached, deadlines that should be met and some friction here and there due to misunderstandings and pressures. So the sports event is really a must to neutralize the pressure, patch up misunderstandings, stop the friction and just enjoy the moment of having some fun. Basketball is ideal for team players and bowling would be nice for most (since not everyone can play basketball). There can even be cheap trophies just to recognize the winners.