This is from an email I got from Yosemite today:
Third Night Free
Book 2 Nights, Get Your 3rd Night FREE!
This offer is for two Yosemite lodging favorites! Don't miss this winter getaway at either The Ahwahnee or Yosemite Valley Lodge. Maximize your winter vacation by staying in the park for 3 nights giving you more time to explore.
Valid for stays January 4 through March 10, 2022
Yosemite Valley Lodge
Booking Notice: Due to our booking process, when booking the Third Night Free offer, the room will display a per night rate. However, the itemized booking display will show only the nightly rate for 2-nights with a $0 rate for the 3rd night.
Here is the link to book: https://reservations.ahlsmsworld.com/Yosemite/Plan-Your-Trip/Accommodations/Yosemite-Valley-Lodge?&CorporateCode=3RDFREE&_ga=2.261781005.1059055872.1638296251-44134285.1631641076