in 2006 and 2008 Bishan Cups, we picked those dates with checking and guessing on a few factors :

1 after Chinese New Year
2 before school March holidays so as to avoid Char Yong Cup period
3 within Chinese Cultural Festival period

After checking and guessing, the window of dates in 2010 is very small, we may reserve 6 & 7 Mar 2010 for 4th Bishan Cup depending on future development.