I had Everest FP+'s on a rainy day. We were informed when we got to the ride that we would be credited one for any ride that day... Matter of fact I'll share the exact email.
Hello, James.
Expedition Everest - Legend of the Forbidden Mountain is temporarily unavailable. Your FastPass+ selection for 11:45 AM to 12:45 PM on 08/24/2016 has been modified.
You are now eligible for one (1) of the following options:
OPTION 1:
If Expedition Everest - Legend of the Forbidden Mountain becomes available later, you may visit this experience any time from 11:45 AM on 08/24/2016 through the end of normal attraction operating hours.
—OR—
OPTION 2:
As a replacement to your FastPass+ selection for Expedition Everest - Legend of the Forbidden Mountain, you may instead visit one (1) of the following FastPass+ experiences anytime from 11:45 AM on 08/24/2016 through the end of normal attraction operating hours.
Experiences
Expedition Everest - Legend of the Forbidden Mountain
It's Tough to be a Bug!
Kali River Rapids
Finding Nemo - The Musical
Primeval Whirl
Kilimanjaro Safaris
Festival of the Lion King
There is no action needed to select the experience in advance. During the designated day and time, just arrive at the one (1) FastPass+ experience of your choice and touch your MagicBand or Theme Park Ticket to enter!
Valid Theme Park admission is required. FastPass+ selections cannot be redeemed during Extra Magic Hours.
Visit My Itinerary on My Disney Experience for more details.