IIRC from what I've heard, the farmer only converts his grass field once a year to parking for 2 weeks. The rest of the year it's just a grass field with tall grass, that's also why the road to it is just a muddy dirt road. It's not a part of Hylkedam and there's no signs that this is parking (except for those 2 weeks). Not sure if it's a good idea to include this on OSM, as it might confuse some when there are events that haven't made a special deal with the farmer, and they get stuck. But nice details you have added around here :D