Duty Dilemma

Should I volunteer for duty on Chinese New Year's Eve so that I won't have to do on the 1st and 2nd? To me, the first day of Chinese New Year is definitely more important than eve... Or should I live it to fate and let the lucky(or rather unlucky) draw decided? 6 men will have to do duty over the 3 days, 2 each day. And the probability is around.. 18%.

If its the draw, then its either doing duty on one of the 3 days or no duty at all. Please show me the way my friends...