Learn to defend yourself. Choose an art that is compatible to your beliefs such as karate, aikido, mace, pepper spray, or shooting. If you face trouble head on, you should resist with everything possible in a life or death situation. Don't get involved in mobs or mob behavior. They become mindless and objectivity is lost.
Self preservation is the key.
Try to ride it out like a bouy in the sea. If caught in a crowd surge, stay away from anything solid like a wall, barrier, or pillar. Keep hands out of pockets and loosen tie.