Kids will end up on multiple layers of laps or under others. Then you tell everyone to organize themselves in their row by . . . Keep score and give the winning row a prize. Divide the crowd in half. Have several members from each side of the sanctuary go to the back of the room behind the last pew.
Nothing can go over a pew.
Have each staff member grab about 3 or 4 kids to wrap them. Pick them up and pass them to the back of the crowd and back up front again. Have the runners or team leaders have a hat with tape all over it on their head. Teams must stick the items called for to the hat to remain there til the end of the game.