The annual Rosh Hashanah pilgrimage to the grave site of Rebbe Nachman will take place September 29 through October 1, 2019. Attendance at this pilgrimage continues to increase, with more than 30,000 people participating in 2018. Any mass gathering is associated with health risks, including the spread of infectious diseases such as measles. On going measles outbreak in Ukraine puts travelers who are not vaccinated at risk.