The last date I have heard is that the 50th Celebration's last day is Sunday, October 1st.
Aww crap...really? I thought it ended at the end of 2006. But it's 18mths long, and I'm counting...and I come up with November as being the 18th month from the beginning of the celebration of May 05, 2005. So they're cutting it short by one month?? That bites!