Having tubes placed in the ears is one of the most commonly performed surgical procedures. The operation is usually quick, relatively painless, and rarely associated with complications.

In general, you should not eat or drink within 8 hours of your scheduled surgery.  This may be relaxed a little for certain procedures but you should double check with your doctor especially if you have a medical condition that requires food every few hours. 
It is important to note that you can still have the surgery even if you have an ear infection.  (Remember  - If you did not have a problem with infections you would not need the surgery.) 

Parents are allowed in the operating room to help their child feel safe while they are waiting to fall asleep.  However as every hospital has different procedures please double check with your operating room.  If a parent is allowed to remain with the child, please one parent only.