teresa martinez was one of the vendors there. >> it was very emotional for us.just came to make a living. >> reporter: they have been coming to events and selling hotdogs for years and never had a problem. >> we are just selling hotdogs here in front of the intersection here. we don't have the permits to do that like every day, we are just trying to get some money, to survive. >> reporter: the hayward area recreation and parks district says that the space was rented out by a private party to host an event and they are required to hire their own security. >> we appreciate the communities concern as we are equally concerned and we are currently reviewing the event and investigating the incident. >> reporter: the promoter is farallon, here is a flyer for the event. the promoter tells us by phone at the vendors were not permitted to be there and when security tried to get them to leave, they refused. he claims, one through cooking grease on a security guard and even pulled a knife out. the vendors dispute that. >> we are not doing that we are not doing anything else