PHP 8.0 compatiblity issues - Cannot save or edit events and leading to WSOD errors

Problem/Motivation

After switching to PHP 8 we cannot save or edit events.

Getting the following errors.

TypeError: Cannot access offset of type string on string in Drupal\recurring_events\Plugin\Field\FieldWidget\ConsecutiveRecurringDateWidget->validateForm() (line 321 of /var/www/html/web/modules/contrib/recurring_events/src/Plugin/Field/FieldWidget/ConsecutiveRecurringDateWidget.php)

Error: Call to a member function format() on null in Drupal\recurring_events\Plugin\Field\FieldType\ConsecutiveRecurringDate::buildDiffArray() (line 189 of /var/www/html/web/modules/contrib/recurring_events/src/Plugin/Field/FieldType/ConsecutiveRecurringDate.php)

ypeError: Drupal\recurring_events\Plugin\Field\FieldType\ConsecutiveRecurringDate::findDailyDatesBetweenDates(): Argument #1 ($start_date) must be of type Drupal\Core\Datetime\DrupalDateTime, null given, called in /var/www/html/web/modules/contrib/recurring_events/src/Plugin/Field/FieldType/ConsecutiveRecurringDate.php on line 256 in Drupal\recurring_events\Plugin\Field\FieldType\ConsecutiveRecurringDate::findDailyDatesBetweenDates() (line 299 of /var/www/html/web/modules/contrib/recurring_events/src/Plugin/Field/FieldType/ConsecutiveRecurringDate.php)

Steps to reproduce

Switch to PHP8.0 and try to save an event.

Proposed resolution

Adding a patch with the fix.

Remaining tasks

Running tests.