As I recall, there are locks in place if the market value of L$ jumps high or low very quickly. There were problems in the past where L$ sold for very, very cheap in 2006 and no one wanted to pay much for them. I think you could get about 550 L$ for 1 US$ at the time and the economy tanked. There are also times when the lab will infuse the market with it's own L$ to help stablize the market.

Other than "Cleanup Week", what other major holidays and events are observed that are only related to the culture of Second Life. I know there is The SL Birthday, the Concierge party, and the Burning Life events specifically acknowleged by the Linden staff. Does anyone observe other events?