Allow to alter occurrences on create
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3220880. -->
Reported by: [edysmp](https://www.drupal.org/user/3169323)
Related to !19
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>When creating an event and setting it to recur - the show/exclude is blank.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>1. Having an Event conten type with a Date field using the Sierra widget.<br>
2. Set start and end dates and a recur option e.g Daily.<br>
3. Click show/exclude buttom.<br>
4. The modal form does't display the date ocurrences to hide/show them.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Allow the users alter the occurrences when creating a new content.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<h3 id="summary-ui-changes">User interface changes</h3>
<h3 id="summary-api-changes">API changes</h3>
<h3 id="summary-data-model-changes">Data model changes</h3>
issue