As many as a million attended this event, and due to a mass panic event (which might have been caused by police trying to prevent some from entering) as many as 18 deaths and 100 injuries occurred.

http://news.sky.com/skynews/Home/World-News/Mass-Panic-At-Love-Parade-In-Duisberg-Germany-At-Least-17-Killed-And-100-Injured/Article/201007415670387?lpos=World_News_Top_Stories_Header_0&lid=ARTICLE_15670387_Mass_Panic_At_Love_Parade_In_Duisberg%2C_Germany%3A_At_Least_17_Killed_And_100_Injured

Reports said a stampede broke out in a tunnel after authorities tried to stop thousands of people from entering the area where the parade is being held.

http://www.businessweek.com/ap/financialnews/D9H5HJ3G1.htm

this annual celebration of techno music originated in 1989 in Berlin

wow--they should have stuck to folk music....