Hi,
According to your post, my understanding is that you wanted to make All Day Event editable in Datasheet view.
There is no out of the box way to accomplish this with SharePoint.
By design in SharePoint 2013, the All Day Event filed is read only in Datasheet view.
As a workaround, you can create a Yes/No column to instead the All Day Event filed.
Then set the All Day Event filed value based on the value of the Yes/No column programmically.
Thanks,
Linda Li
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