Original sentence: December - Part of the Marina Bay Sands will be opened.July 6 to July 10 - The 9th World Convention of the International Confederation of Principals 2009 will be held at Suntec International Convention and Exhibition Centre
Edited sentence: August 14 - One Year Countdown Event for the 2010 Summer Youth Olympics at the Padang.August 16 - The National Day Rally 2009 speech will be delivered.July 6 to July 10 - The 9th World Convention of the International Confederation of Principals 2009 was held at Suntec International Convention and Exhibition Centre