Event Tickets – Additional checkin options

The Event Tickets integration already allows updating a custom field when someone checks into an event: https://wpfusion.com/documentation/integrations/the-events-calendar-event-tickets/#event-check-ins

For additional control:

1. Add an option to apply tags (per event) when someone checks into an event
2. Add an additional field event_checkin_event which syncs the name of the event when the person checks in.