Non Farm Payroll normally on the First Friday of every month.
http://en.wikipedia.org/wiki/Nonfarm_payrolls

http://www.tradingeconomics.com/united-states/non-farm-payrolls

http://www.fxstreet.com/economic-calendar/event.aspx?id=9cdf56fd-99e4-4026-aa99-2b6c0ca92811