Hi here you can find the programming contest calendar.
It includes, official Google CodeJam Calendar.
Topcoder Calendar by darnley.
And some of my own added events ( i think the length is not always correct, but start time is )
http://pt1989.22web.net/cal/
http://pt1989.22web.net/cal/
You can add it to your Google Calendar, and activate email notifications and depending on your country even free SMS Notifications.
Good luck and happy practising.
Yes, I already have your calendar in my Google Cal.
And I also want to ask you what are A Contest from Dinajpur, Bangladesh and A Contest from BUBT, Bangladesh. There no information provided in your cal.
Also, could you add some information about feedback to the calendar properties?