My SIL who claims to be a Catholic will be celebrating both the trans visibility cr*p and Easter. Her new husband is a Mormon so I have no idea what he celebrates.
Wow 😮
Some Mormons undoubtedly become Christians, and evidently leave the Mormon sect they were members of behind.
(Thanks to delacort for compiling this list)
There are many things that individuals can celebrate. Here is an official link to some LDS data.