Dear …
RE: Postponement of __(Name of Event)__
We regret to inform you that the __(Name of event – example: Ribbon-cutting Ceremony)__ you were invited to attend on __(date)__, has been postponed. Unfortunately, __(briefly describe reason)__ has prevented us from moving ahead with our __(type of event – example: Grand Opening/“type” kickoff/etc.)__ as scheduled. Please accept our apologies for any inconveniences this may cause you.
The issues at hand will be dealt with in an expeditious manner as it is our intent to reschedule the __(Name of event – example: Ribbon-cutting Ceremony)__ as quickly as possible. We continue to look forward to having you attend our __(type of event – example: Grand Opening/“type” kickoff/etc.)__ and will notify you once we have set a new date. On behalf of __(Name of Organization)__, we thank you for understanding this situation.
We remain optimistic that all will now proceed smoothly, allowing us to be in contact with you very soon with the revised date.
Respectfully yours,