You can schedule the release of a blog post, event or page. This will keep it unpublished until the selected date. Some good things to know about scheduling:
After creating your post or page, go to the top right of the page and click "Edit" next to "Publish immediately":
This will open a date and time picker:
Choose the date and time you want to publish. After selecting, the blue "Publish" button becomes a blue "Schedule" button. Press the "Schedule" button - if it was done correctly, you will see when the post is scheduled for publishing. For example:
You can publish or edit the scheduled date at any time by pressing "Edit" again and then "Update".