What can you eat or do to stop your period from starting on your due date?

There are certain pills that you can obtain with a prescription. They can momentarily delay your period so that if you have an event coming up around your cycle you can push back your cycle. "Norethisterone is a progestogen hormone in tablet form, which is taken three times a day for three days before your period is due and then for seven days to delay the period. At the end of the seven days, the tablets are stopped and your period starts as normal. It is available on NHS prescription from your GP." (taken from http://www.netdoctor.co.uk/ate/womenshealth/207372.html)