And no, that's not a typo in the headline - via an agreement with Apple, the classic holiday specials will be shown commercial-free on your local PBS (public broadcasting) station, a change from airing on ABC in previous years.
A Charlie Brown Thanksgiving is scheduled to air Sunday, November 22, 2020 from 7:30 - 8:00 PM (Eastern/Pacific).
A Charlie Brown Christmas is scheduled to air Sunday, December 13, 2020 from 7:30 - 8:00 PM (Eastern/Pacific).
Check the listings of your local PBS channel to confirm; note that these broadcasts were just announced, so it may take a day or two for your station's listings to be updated.
The specials will also air on PBS Kids, which is a broadcast sub-channel available over the air in many areas as well - so if you don't see it on your local PBS station, check PBS Kids, if you receive it.
You can read the full press release from PBS.
The two specials will still also be made available for free via the Apple TV+ subscription streaming service, as previously announced.
A Charlie Brown Thanksgiving will be available free to watch, without a subscription, on Apple TV+ from Wednesday, November 25 - Friday, November 27, 2020; A Charlie Brown Christmas will be available from Friday, December 11 to Sunday, December 13, 2020.
To watch A Charlie Brown Thanksgiving or A Charlie Brown Christmas on Apple TV+, you'll need to either install the Apple TV+ app on a supported device; or watch it via a web browser, on any computer, at tv.apple.com .
Supported devices include: Apple devices including the iPad, iPhone, Apple TV set-top boxes, and Macs; Roku or Amazon Fire TV streaming devices; and select smart TVs from Samsung, LG, Vizio, or Sony. For more information about supported devices and setting Apple TV+ up on them, see this Apple support webpage.
You do not need to subscribe (or even start a free trial) to Apple TV+ in order to install the app on any of those devices and watch the specials during the free period. However, you will have to sign in with a new or existing account Apple account (such as the one you use for iTunes, Apple Music, or iCloud). Signing in does not subscribe you to Apple TV+.
Once you're in the Apple TV+ app, the show will likely be featured on the front page of the app, or can be found in the "Kids" section. At the tv.apple.com website, if you don't see the show listed right away, you may need to scroll quite a ways through the list of shows to find it.
See Apple's website for more information about the AppleTV+ streaming service in general.