Hmm… this could lead to something interesting:

In 2008, sexual activity was decriminalized in the most famous and popular park in all of Amsterdam, Vondelpark (which receives 10 million visitors per year). However, to avoid problems with the police, it’s important to know that, under this law, sex is restricted to nighttime and, further, making excessive noise and/or leaving a mess behind (like used condoms) can get you in trouble.

There are house parties, party houses, hotel takeovers, campouts, and now it appears possible to have a party park.