If planning of big celebration postponed?

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Have you ever experienced that you were about to attend or invited to a big celebration but it was postponed for some reason? Is there any some instances that you postponed the big celebration even though you have paid for it already? What are the reasons for you to do that? What are the dark sides that happened when you postponed the event you were organizing? Or what were the consequences when you decide to postponed the event? What do you think was the advantage when you decide to postponed the event?