2. If it is really impossible to reschedule, I suggest you make the wedding ceremony as special as possible, such as: simplify the wedding ceremony as much as possible, announce to the guests that all or half of the wedding money will be donated to the disaster area, and invite the staff of the local Red Cross to accept your donation at the wedding site if possible. As long as you explain the situation, they will be happy to go. I think everyone will be moved by your behavior. Best wishes to you. It is possible that the whole country will know you because of this.
No matter when you hold your wedding, I wish you all the best!