The lesson you`ve learned here is that if you have to take risks, take the risk for the things you have control over. If the special event holder had been responsible for the maintenance of the building, including the roof, this type of Breithalt would have been understandable. But in this case, the nonprofit was not responsible for the maintenance, so its agreement to consider the owner unharmed on the site was too broad. On the other side of the safety issue, there are the agreements that you should require from suppliers and subcontractors. In these documents, the signatory undertakes to keep the non-profit organization harmless in the event of an accident resulting from its operation. Here`s the story of a nonprofit`s experience when it forgot that a seller signs a safe deal: that owner of a special event hosts an outdoor show with sellers.