There is a new module named Date Recur Field (repeating dates) that can help you.

Recurring dates, i.e. date repeat, for Drupal 8.

Provides a new field type that supports repeating dates via recurrence rules (RRule). For RRule compilation, php-rrule is used.

If you need integration with Calendar module you need to apply Patch for calendar module

I think that the module needs integration with the Datetime Range core module because for the moment to show a multi days event in Calendar you need the Improve the Views integration for DateRange fields patch.

There is a new module named Date Recur Field (repeating dates) that can help you.

Recurring dates, i.e. date repeat, for Drupal 8.

Provides a new field type that supports repeating dates via recurrence rules (RRule). For RRule compilation, php-rrule is used.

If you need integration with Calendar module you need to apply Patch for calendar module.

I think that the module needs integration with the Datetime Range core module because for the moment to show a multi days event in Calendar you need the Improve the Views integration for DateRange fields patch.