As an employer you have a duty of care to your employees, and you are responsible for ensuring that they get home safely from your company event. So:
- Book taxis (licenced cabs) from a reliable firm well in advance of the event.
- Ensure that none of your employees plans to drive whilst under the influence of alcohol
- Make sure your staff realise that whilst they are of course allowed to let their hair down, they shouldn't take that too far.
- Be sure that someone responsible is in the background, watching over everyone in the nicest possible way.
And, of course, enjoy your party and have a very Merry Christmas!