What's the next doomsday coming up on the calendar after 2012?

I still hear about the killer astroid that is to hit the earth in 29 yrs. In fact some kid in grade school found that the mathmatical process related to it tragectory was wrong and he found the correct equation and instead of there being a 1 in 4,ooo,ooo chance to hit us, it came down to 1 in 459 chance to hit us....Send In Bruce Willis Right Away!!!!