The Three Kings Day festivities are taking place from January 2nd through January 6th, so -- along with the end of the holiday season -- that event will bring out some extra people on 1/5 and 1/6.
"Frozen Fun" is beginning in an
official capacity on Wednesday, January 7th (it is sneak peek-ing on 12/20/14). Frozen Fun will involve 4 different locations in Hollywood Land in DCA : (1) a sing-along at the Muppet theater; (2) an Anna/Elsa Meet & Greet, as well as Do You Want to Draw a Snowman, in the Animation Building; (3) a "Freeze the Night" party in the old Mad T Party location; and (4) Olaf's Snow Fest -- a snow play area and Olaf meet & greet spot at Stage 17.
Also, there will be a
Frozen addition to the Storybook Land Canal Boat ride in
Disneyland. There will also be a special
Frozen show at the Royal Theatre in Fantasyland.
You can bet that lots and lots of people will show up for the Frozen Fun stuff (in both parks), especially considering that all of the blocked Annual Pass dates will be lifted at some point that week. In fact, I could be wrong, but I think that the last time I checked the DLR website it seemed that
all levels of previously blocked Annual Pass holders will be able to get into the parks as of January 5th -- though I could be wrong on that. If I read that info correctly and am remembering it correctly, then you can bet it will be crowded.
To be honest, I think that's why Haunted Mansion Holiday is (supposedly) closing six days later than expected -- because Disney knows that lots of AP holders and other guests will descend upon DLR to see the official debut of Frozen Fun and they want to make some of their other offerings available for them, for just a bit longer (especially before a lot of kids head back to school on 1/12/15).
IASW Holiday will still be open as well, so between that, Haunted Mansion Holiday and the Frozen Fun elements added into Disneyland Resort, the guests will spread out between the two parks. Olaf's Frozen Ice Rink and the Winter Village in Downtown Disney will be open through February 22, 2015.