Now, however, the police and park authorities have stepped in once again. According to the blog post:
Towards the end of last summer there were murmurings around the park scene of the police clamping down on street lives and raves, then we saw a couple of parties shut down by police, and then by about mid-November the signs went up. Basically the signs say "On the street, the playing of instruments, and the selling of goods or food is prohibited".