I would wait to decide until we find out exactly what is happening with the Halloween Party. In the Halloween Time at DLR Superthread we've discussed quite a bit the rumors that the party may be moving back to DCA this year (which is where it used to be held prior to 2010), and also the rumors that there are "big changes" coming to the party this year. If any of that turns out to be true it may impact how and when people are let into the park for the party, and it would also definitely impact what was included in the party (meaning the Halloween Screams fireworks and the Cavalcade).
If there are no changes coming to the party and it is going to be business as usual in
Disneyland, the dates will probably be announced in mid-to-late June and the tickets will go on sale in July. If there are any major, significant changes coming to the party there might be a Parks Blog about it as early as next month or early June.
I think that the events of the 60th anniversary would be a really good reason to move the party just for this year, if DCA were prepared to have the party again -- those Diamond Anniversary/Celebration events are going to affect the Christmas/holiday season entertainment too, so It would make sense if they had an impact on the Halloween Party. But there don't appear to be any rumors about Halloween decorations coming to DCA this year (there would have to be decorations), or special Halloween ride overlays in DCA, or anything to indicate that a party relocation is actually happening. So I am inclined to think that there
was a plan to relocate the party at one point last year, and maybe it got scrapped this year.
In any case, we'll know more in the next 2 or 3 months. Stay tuned to the Superthread -- we discuss all news, rumors and speculation there!

