[{quoted}](name=Zair Umbras,realm=NA,application-id=Ir7ZrJjF,discussion-id=dEZgxMn0,comment-id=00000000,timestamp=2015-11-01T11:38:31.711+0000)
False.
Check this post. Harrowing is no longer confined to October... or any month or time of the year in general.
which is ridiculous since its been in the lore since the start of harrowing as being one of the most important holidays in Valoran:
Each calendar year, the celestial bodies of Runeterra align in a particular astronomical event. This lengthy occasion - beginning with a partial eclipse on the 18th of October and culminating in a full solar eclipse on the 31st of October - is of one of the most significant holidays in Valoran. The alignment occurs annually around the time of the harvest, and is known as the Harrowing due to its dusky setting. For obvious reasons, the occasion is marked by superstitions surrounding the world's dark denizens, creepy crawlies, and things that generally go bump in the night.
While rural folks still believe that this is a time of great foreboding, most of Valoran has taken to commemorating the Harrowing through a bit of good, clean fun. Citizens of the city-states don monstrous costumes and exchange holiday sweets with one another as part of the revelry. Large costume parties, where patrons wear either light or dark costumes (with the intention of either warding off or confusing evil) are quite popular, and those of opposite colors are encouraged to exchange gifts with one another. However they're celebrating, all across Valoran, spirits are as high as the night is long.
http://leagueoflegends.wikia.com/wiki/Harrowing
and yes I know they can change the lore/storylines anyway they like anytime they want, but it all just seems super fishy, how that post you linked was announced less than 2 weeks ago, on a forum that would barely get read (in the PBE section).
It was almost setup to seem like:
"hey guys were not going to be able to focus on harrowing and do Worlds at the same time, so we need to decide on what to do"
"well why not just cancel harrowing, and post an announcement on one of the least popular sections of the boards, so no one can say we didnt warn them of this, and just tell them its not cancelled but rather postponed...."
"brilliant! give this man the +1 cookie hat"
and I mean there is still no word from any Rioter on the subject after all the countless posts about Harrowing.