Look for specimens in all stages of development. Gather up some surrounding material or part of the substrate to accompany the specimen. Wrap it in foil or put it in a container so it isn't injured. Carefully place the wrapped specimen on a rack or in a hefty cardboard box with other specimens. Try to keep the specimens upright.
Some mushrooms are geotropic and respond to gravity.
Keep it under cool conditions if storing it overnight. Way entrance to Warren Magnuson Park and follow the signs to the old Navy brig. Mushroom receivers should be on hand from about 5 PM to approximately midnight Thursday and Friday. If no one is there, just leave your boxes. The name fairy ring comes from an old folk-tale.