To add to Krzysztof's answer. There were also studies suggesting that people can control somewhat the date of their death around major events.
This study, that won the 2001 Ig Novel for economics suggests that death rates changed around a change at the inheritance tax rate people.
This paper examines data from U.S. federal tax returns to shed light on whether the timing of death is responsive to its tax consequences. We investigate the temporal pattern of deaths around the time of changes in the estate tax system - periods when living longer, or dying sooner, could significantly affect estate tax liability. We find some evidence that there is a small death elasticity, although we cannot rule out that what we have uncovered is ex post doctoring of the reported date of death.
This study, that suggests the same with asian male Cancer patients around Chineese Harvest Moon Festival.
RESULTS: There were significantly fewer deaths overall in men before the holidays than after (p-value equals 0.0081), with most of the difference being due to cancer deaths, particularly among men over 75 years of age. For women, there were actually more deaths before than after the holidays. The data, stratified according to age, gender, disease and holiday, yielded only five out of 48 variables with a p-value of less than 0.05, which was slightly above chance, considering the large number of comparisons made. In four of the five situations, there were significantly fewer deaths before than after the holidays; but after Bonferroni correction, only the finding of fewer cancer deaths for men aged over 75 years before HMF was significant.
Other than cancer deaths in males, we found little evidence in this dataset of death postponement until after important holidays in the Hong Kong Chinese population.
While the studies are not conclusive, they do suggest that if a person really wants to live through some important occasion (like a major holiday) he or she may be able to postpone their death by a few days.