It is not recommended to use every space in the office for this type of event. That could result in a big mess, which will bring a more extensive cleanup later. Thus, it would be best to choose in advance the most suitable area for this. Depending on the number of guests and other aspects to consider. It is also a good idea to choose an area with the least amount of breakable objects. Of course, your employees should remember that they are still in their workplace. So, they must behave accordingly.