Punakha Drubchen is from the 3 - 5 of March, followed by the Punakha Tshechu from 6 – 8 of March, 2009. These important historical and religious festivals are held every year around this time of the year in the Punakha Dzong. Check out the links below for some useful information on these two festivals.
Bhutan Free Spirit
Keys to Bhutan
Bhutan Dhenzang Travel
Silver Dragon Tours