All Events, Closures and Refurbishments at Disneyland during April and September of 2015 and 2021

April 2015

Early 2015 - Oct. 02Pacific Wharf : Disney California AdventureBlue Sky Cellar closed indefinitely
January 2015 - N/AHollywood Land : Disney California AdventureMuppet*Vision 3D closed indefinitely. The theater has been renamed the Sunset Showcase. From July 1- August 14 the theater will host a preview of Pete's Dragon.
Early 2015 - Summer 2015Condor Flats : Disney California AdventureFly 'n' Buy
Early 2015 - Mar. 07Cars Land : Disney California AdventureLuigi's Flying Tires Will be replaced by Luigi's Rollickin' Roadsters. Scheduled to open 3/7/16.
Early 2015 - Apr. 10Tomorrowland : Disneyland ParkMagic Eye Theater The theater house the sneak preview of the upcoming film "Tomorrowland." This sneak peek will play every 15-20 minutes throughout the day. No FastPass+ will be available. It's not known at this time whether Captain EO will return when the sneak preview is over.
Early 2015 - Apr. 02Critter Country : Disneyland ParkHungry Bear Restaurant
Jan. 06 - May. 14Condor Flats : Disney California AdventureSoarin' Over California
Jan. 07 - May. 16Fantasyland : Disneyland ParkMatterhorn
Feb. 02 - Jul. 02Fantasyland : Disneyland ParkPeter Pan's Flight
Feb. 15 - Mar. 15Grizzly Peak : Disney California AdventureGrizzly River Run Closed for refurbishment.
Apr. 01 - 2016Tomorrowland : Disneyland ParkInnoventions
Apr. 20 - May. 01Adventureland : Disneyland ParkIndiana Jones Adventure
Apr. 27 - May. 01Grand Californian : HotelsFountain Pool

September 2015

Early 2015 - Oct. 02Pacific Wharf : Disney California AdventureBlue Sky Cellar closed indefinitely
January 2015 - N/AHollywood Land : Disney California AdventureMuppet*Vision 3D closed indefinitely. The theater has been renamed the Sunset Showcase. From July 1- August 14 the theater will host a preview of Pete's Dragon.
Early 2015 - Mar. 07Cars Land : Disney California AdventureLuigi's Flying Tires Will be replaced by Luigi's Rollickin' Roadsters. Scheduled to open 3/7/16.
Feb. 15 - Mar. 15Grizzly Peak : Disney California AdventureGrizzly River Run Closed for refurbishment.
Apr. 01 - 2016Tomorrowland : Disneyland ParkInnoventions

April 2021

May. 30 - No details availableDowntown Disney : Downtown DisneyDowntown Disney West End Closures The following Downtown Disney locations closed in preparation for the construction of a proposed new hotel which has since been canceled. No details on what might be going into the now available retail spaces.
 
AMC Theaters
ESPN Zone
Rainforest Cafe
Mar. 14, 2020 - TBDDisneyland Park : Disneyland ResortFinding Nemo Submarine Voyage Finding Nemo Submarine Voyage will close for refurbishment beginning March 14th, 2021. A reopening date has not yet been announced.
Mar. 18 - April 5Disney California Adventure : Disneyland ResortA Touch of Disney Disneyland's "A Touch of Disney" event is a separately ticketed event in Disney California Adventure running Thursdays through Mondays from 12PM-8PM.

September 2021

Mar. 14, 2020 - TBDDisneyland Park : Disneyland ResortFinding Nemo Submarine Voyage Finding Nemo Submarine Voyage will close for refurbishment beginning March 14th, 2021. A reopening date has not yet been announced.
Sept. 9 - Nov. 5Disneyland Park : Disneyland ResortBig Thunder Mountain Railroad Big Thunder Mountain Railroad will close for refurbishment from September 9th through November 5th, 2021.