Issue with the Sanity calendar plugin not displaying the schedule button, but resolved with help from another user.

{
  "types": [
    {
      "type": "homePage",
      "field": "publishedAt"
    }
  ]
}

{
  "types": [
    {
      "type": "article",
      "field": "publishedAt",
      "titleField": "title"
    }
  ],
  "calendar": {
    "event": {
      "dateFormat": "MMMM, dd yyyy",
      "timeFormat": "hh:mm a",
      "showAuthor": "false"
    }
  },
  "filterWarnings": [{}]
}

export default {
  name: 'article',
  title: 'Article',
  type: 'document',
  icon: GiBeech,
  fields: [
    {
      name: 'title',
      title: 'Title',
      type: 'string',
    },
    {
      name: 'slug',
      title: 'Slug',
      type: 'slug',
      options: {
        source: 'title',
        maxLength: 96
      }
    },
    {
      name: 'publishedAt',
      title: 'Published Date',
      type: 'date'
    }, //...

{
  "types": [
    {
      "type": "article",
      "field": "publishedAt",
      "titleField": "title"
    }
  ],
  "calendar": {
    "event": {
      "dateFormat": "MMMM, dd yyyy",
      "timeFormat": "hh:mm a",
      "showAuthor": "false"
    }
  },
  "filterWarnings": [{}]
}

export default {
  name: 'article',
  title: 'Article',
  type: 'document',
    fields: [
    {
      name: 'title',
      title: 'Title',
      type: 'string',
    },
    {
      // TODO: import slugify fn -- do I want this to be legible?
      name: 'slug',
      title: 'Slug',
      type: 'slug',
      options: {
        source: 'title',
        maxLength: 96
      }
    },
    {
      name: 'publishedAt',     /* <<< the important bit */
      title: 'Published at',
      type: 'datetime'
    },
// continued...

Performing the publish event, in the future
This plugin does not perform the publishing of documents on its own, as it is just a Studio plugin running in an editors' browser. In order to actually perform the scheduled publishing, a script needs to run either periodically, or at the given publishing times to perform the publish action.

We advise setting up a cronjob running for instance every minute that checks if any document should be published and then perform that action. A full script that does this is represented below.

When the publish event eventually occurs, any newer draft will be discarded. This is why the plugin warns you if you make further changes to a document after you schedule it. If you don't want to lose the newer changes an editor will need to Reschedule them. The plugin will prompt for this with a warning in the calendar view and an updated document action.