Be sure to clearly describe the scope of the activity so there is no confusion. Include dates and times if applicable.
(e.g. The Indemnifier wishes to hold a camp for school children to be held between September 27 and September 30, 2013. The camp will be held on property belonging to the Indemnitee. The Indemnitee wishes to be indemnified against any and all liability that may result from this event.)