Once in the crowd, you can not take any action. It is necessary to get rid of excess objects (bag, umbrella, long scarf), bend your elbows and press them to the body. You should stay in the middle of the flow of people, avoiding the crowds that are motionless on the way (pillars, stands, fences, trees, walls). In no case should not be allowed to knock yourself down. Having fallen, you must immediately protect your head with your hands and press your knees to your chest. Be sure to try to get to your feet, resting one foot on the ground and abruptly leaning towards the crowd.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.