Jesus had only 12 members attend and partake the last meal and Memorial.There were no observers in the room.Each disciple was given bread to eat and wine to drink.There is no mention of other people in the room who couldn't eat or drink the last meal.This was only for those who would partake of this meal.
Why does the WTS feel that observers need to be at this yearly event? Why can't the Elders who(supposedly) have any 144,000 in their congregations,have a memorial with only these members? If Jesus wanted observers he would of had some at his last meal and requested that they be present from then on.