Dog Fencing
For events run off-leash, like coursing and agility, one problem is how to fence an area safely - for the dogs and the site and for the people who have to haul the stuff around.
Best option: site with built-in fencing
Snow-fencing, not very period, but fairly portable. (perhaps not in construction orange?) Coursing
File:BnF-MS-616f119vBellsNettingFence.PNG
http://www.incord.com/home_garden/tree-house-barrier-nets.htm
http://www.westcoastnetting.com/netting-products/amusement-park/handrail.html
Fabric panels?
Other ideas?