Quote Originally Posted by saike View Post
so there will be a second half? and crystal will carry over?
From guide:
Remember, there will be second "half" of this event at 20th-27th, so you will have additional week to grind up necessary MCs.
and
Q: What will happen to unspent Moment Crystals when event ends?
A: You will keep all unspent MCs and will be able to use them to purchase target units in other MC Revivals. And yes, that meant pre-grinding for future events is possible.