Take a backpack on your back or a suitcase in your hand and walk in a crowd while trying to minimize contact with others. Work with a partner or a few on moving with the backpack while avoiding people who are coming at you and dealing with people trying to grab and hit you. consider loosing the bagage if a logical outcome without it is not found. For example if you are in a pushing match on your suitcase and a knife is drawn it may be best to loose contact or on the other hand use the suitcase as a tool to direct the blade toward more calming venues.
Keep breathing and remember that what works once may not work again.