Just to clarify that future entries into the calendar section are sometimes unverified preliminary dates, which may have been 'correct' at the time of entry, but as such may become inaccurate, updated or rescheduled. The long term entries are usually updated as they approach.
The date of the perihelion passage of Comet C/2010 B1 (Cardinal) was incorrectly entered as 2010 and should have been 2011 (2011-Feb-06.93236378). It has now been corrected.