Postpone?

Its a tricky one and it depends on each supplier, through covid people moved 3 or 4 times but that was different. As a rule suppliers would rather keep your wedding after going through all the process of talking to you agreeing a price. Only problem could be with the venue or if suppliers are already booked for your new date - they may also be wanting to charge the new date at the new rate.

How did they all react before should give you an idea of how they will react this time.

Many vendors allow you to reschedule the wedding 1-2 times, but it depends on their policy and date availability. It’s best to discuss your situation directly with each vendor. They often accommodate changes, especially for valid reasons. Good luck!