All Events, Closures and Refurbishments at Disneyland during June and December of 2015 and 2021

June 2015

Early 2015 - Oct. 02Disney California Adventure : Disneyland ResortBlue 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. 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
May. 01 - PERMANENT CLOSUREHollywood Land : Disney California AdventureOlaf's Snow Fest

December 2015

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.
November 15 - TBATomorrowland : Disneyland ParkSeason of the Force a variety of Star Wars-themed exhibits and events including Star Wars Launch Bay, Hyperspace Mountain overlay, and Star Wars-themed food.
Nov. 16 - TBATomorrowland : Disneyland ParkSeason of the Force Star Wars overlay, featuring Star Wars Launch Bay, Hyperspace Mountain, Path of the Jedi, and Star Wars-inspired foods at The Galactic Grill.

June 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
2019 - Early 2023Disneyland Park : Disneyland ResortMickey & Minnie's Runaway Railway (DLR) The first major Mickey-themed ride-through attraction, is coming to Disneyland’s Mickey’s Toontown in Early 2023 as part of the reimagination of Mickey’s Toontown. The ride will be housed in the El CapiTOON Theater, where Mickey and Minnie are premiering their newest short, Perfect Picnic.
March 14th, 2020 - July 25th, 2022Disneyland Park : Disneyland ResortFinding Nemo Submarine Voyage Finding Nemo Submarine Voyage closed for refurbishment on March 14th, 2020. It will reopen on July 25th, 2022.
Jun. 04Disney California Adventure : Disneyland ResortAvengers Campus -- Grand Opening

December 2021

2019 - Early 2023Disneyland Park : Disneyland ResortMickey & Minnie's Runaway Railway (DLR) The first major Mickey-themed ride-through attraction, is coming to Disneyland’s Mickey’s Toontown in Early 2023 as part of the reimagination of Mickey’s Toontown. The ride will be housed in the El CapiTOON Theater, where Mickey and Minnie are premiering their newest short, Perfect Picnic.
March 14th, 2020 - July 25th, 2022Disneyland Park : Disneyland ResortFinding Nemo Submarine Voyage Finding Nemo Submarine Voyage closed for refurbishment on March 14th, 2020. It will reopen on July 25th, 2022.
Oct. 4, 2021 - Nov. 10th, 2023Disneyland Park : Disneyland ResortTarzan's Treehouse Tarzan's Treehouse will close for refurbishment beginning October 4th, 2021. Disney has revealed that the attraction is being rethemed to an adapted version of the original Swiss Family Treehouse concept that Walt and his Imagineers envisioned in 1962.
Nov. 11 - Dec. 9Disneyland Park : Disneyland Resort2021 Disney Merriest Nites
Nov. 11 - Dec. 4Disneyland Park : Disneyland Resort"it's a small world" Holiday "it's a small world" Holiday is reportedly closed due to flooding. It is expected to reopen December 4th, 2021.
Nov. 14, 2021 - Jan. 9, 2022Disney California Adventure : Disneyland Resort2021 Disney Festival of Holidays at Disney California Adventure