Just on the off-chance that anyone is still reading this forum:
This week's News Shopper announces that proposals by Festival Republic are going before Bromley Council shortly for two music festivals to be held on the upper terraces of Crystal Palace Park on two consecutive three-day weekends in July for the next 3 years. This may or may not fill you with delight, depending on your experiences of events in recent years. The festivals have a potential capacity of 45 thousand - presumably spread over the three days. Apparently Crystal Palace Park Trust have published some details.
I'm unable to copy the URL in here, but have made a Tinyurl: