10000€ would cover the costs for material, supplies and fuel and provide the volunteers everyday with food.
With 5000 € we could buy a carpet, get some floor chairs, meditation cushions, blankets and yoga mats. And the meadow itself could become community property
You can see the current status of the project in a Facebook photo album (even without being logged in). https://www.facebook.com/photo.php?fbid=1180126695656295&set=a.1180127338989564&type=3&theater